Here are the basic and very important 27 C programs for the 1st year students of engineering.
1.To print message on the screen.
Program:
#include
<stdio.h>
int
main()
{
printf("Hello world\n");
return 0;
}
Output:
Hello world
2.WAP that will take an input and display it on the
screen.
Program:
#include
<stdio.h>
int
main()
{
int a;
printf("enter any number for an input\n");
scanf(%d%,&a);
printf(“\n the entered number is %d”,a);
return 0;
}
Output:
enter any
number for an input
5
the
entered number is 5
3.WAP that will take
dividend and divisor and display the quotient and remainder.
Program:
#include
<stdio.h>
int
main()
{
int dividend,divisor,remainder;
float quotient;
printf("enter any dividend and divisor \n");
scanf(“%d%d”,÷nd,&divisor);
quotient=dividend/divisor;
remainder=dividend%divisor;
printf(“\n the quotient is %f and remainder
is %d”,quotient,remainder);
return
0;
}
Output:
enter any
dividend and divisor
5
7
the
quotient is 0.7142 and remainder is 5
4.WAP to add two numbers
a) using third variable
b)
without using third variable
a)Program:
#include
<stdio.h>
int
main()
{
int a,b;
printf("enter any numbers for addition
\n");
scanf(“%d%d”,&a,&b);
printf(“\n the sum is %d”,a+b);
return 0;
}
Output:
enter any
numbers for addition
5
9
The sum
is 14
b)Program:
#include
<stdio.h>
int
main()
{
int a,b,c;
printf("enter any numbers for addition
\n");
scanf(“%d%d”,&a,&b);
c=a+b;
printf(“\n the sum is %d”,c);
return 0;
}
Output:
enter any
numbers for addition
5
7
The sum
is 12
5.WAP that will take principal,rate and time as input and display the simple interest.
Program:
#include
<stdio.h>
#include <conio.h>
#include <conio.h>
void
main()
{
{
float p, r, si;
int t;
int t;
clrscr();
printf("Enter
the values of p,r and t\n");
scanf ("%f %f %d", &p, &r, &t);
scanf ("%f %f %d", &p, &r, &t);
si = (p * r * t)/ 100.0;
printf ("Amount = Rs. %5.2f\n", p);
printf ("Rate = Rs. %5.2f%\n", r);
printf ("Time = %d years\n", t);
printf ("Simple interest = %5.2f\n", si);
printf ("Amount = Rs. %5.2f\n", p);
printf ("Rate = Rs. %5.2f%\n", r);
printf ("Time = %d years\n", t);
printf ("Simple interest = %5.2f\n", si);
}
Output:
Enter the values of p,r and t
2000
8
3
Amount = Rs. 2000.00
Rate = Rs. 8.00%
Time = 3 years
Simple interest = 480.00
6. WAP to display the size of integer,float and char using sizeof()
operator
Program:
#include<stdio.h>
#include<conio.h>
void main()
{
int x;
float y;
double z;
char ch;
clrscr();
printf("Size of integer variable x:%d\n",sizeof(x));
printf("Size of float variable y:%d\n",sizeof(y));
printf("Size of double variable z:%d\n",sizeof(z));
printf("Size of character variable char:%d\n",sizeof(char));
getch();
}
Output:
Size of integer variable x:2
Size of float variable y:4
Size of double variable z:8
Size of character variable char: 1
#include<conio.h>
void main()
{
int x;
float y;
double z;
char ch;
clrscr();
printf("Size of integer variable x:%d\n",sizeof(x));
printf("Size of float variable y:%d\n",sizeof(y));
printf("Size of double variable z:%d\n",sizeof(z));
printf("Size of character variable char:%d\n",sizeof(char));
getch();
}
Output:
Size of integer variable x:2
Size of float variable y:4
Size of double variable z:8
Size of character variable char: 1
7.To find
that given number is even or odd.
Program:
#include <stdio.h>int main(){ int num; printf("Enter an integer you want to check: "); scanf("%d",&num); if((num%2)==0) /* Checking whether remainder is 0 or not. */ printf("%d is even.",num); else printf("%d is odd.",num); return 0;}
Output 1:
Enter an integer you want to check: 25
25 is odd.
Output 2:
Enter an integer you want to check: 12
12 is even.
8.WAP to check whether number is prime or not.
Program:
#include<stdio.h>
#include<conio.h>
int main()
{
int n; int i; printf("
enter the number : ");
scanf("%d",&n);
for(i=2; i<n; i++)
{
if(n%i==0)
{
printf("%d is
not a prime number.",n);
getch();
return (1);
}
}
printf("%d is a prime number.",
n);
getch();
}
Output:
enter
the number : 29
29
is a prime number.
9.WAP to check whether the year entered by the user is leap year or not.
Program:
#include<stdio.h>
int main()
{
int year;
printf("Enter any year: ");
scanf("%d",&year);
if(((year%4==0)&&(year%100!=0))||(year%400==0))
printf("%d is a leap
year",year);
else
printf("%d is not a leap
year",year);
return 0;
}
Output:
Enter any year: 2008
2008 is a leap year
10.WAP for greatest among two numbers.
Program:
#include<stdio.h>
main()
{
int a,b,c;
printf("\n
Enter two Numbers: ");
scanf("%d
%d",&a,&b);
c=(a>b)?a:b;
printf("\n The
Greatest number is : %d",c);
return(0);
}
Output:
Enter two Numbers: 10
20
The
Greatest Number is : 20
11.To find the greatest among 3 numbers
a)using if else statements.
Program:
#include <stdio.h>int main(){ float a, b, c; printf("Enter three numbers: "); scanf("%f %f %f", &a, &b, &c); if (a>=b) { if(a>=c) printf("Largest number = %.2f",a); else printf("Largest number = %.2f",c); } else { if(b>=c) printf("Largest number = %.2f",b); else printf("Largest number = %.2f",c); } return 0;}
Output:
Enter three numbers: 12.2
13.452
10.193
Largest number = 13.45
b)To
find greatest among three numbers using &&.
Program:
#include<stdio.h>
Int main()
{
Int a,b;
Printf(“\n Enter two numbers”);
Scanf(“%d%d”,&a,&b);
If((a>b)&&(a>c)
{
Printf(“\n a is greater”);
}
Else
If((b>a)&&(b>c)
{
Printf(“\n b is greater”);
}
Else
If((c>a)&&(c>b)
{
Printf(“\n c is greater”);
}
Getch();
Return 0;
}
Output:
Enter three numbers: 12.2
13.452
10.193
Largest number = 13.45
12.WAP greatest among four numbers.
Program:
#include<stdio.h>
main()
{
int a,b,c,d;
clrscr();
printf("Enter the Four Numbers :");
scanf("%d %d %d %d",&a,&b,&c,&d);
if(a>b)
{
if(a>c)
{
if(a>d)
{
printf("%d is big",a);
}
else
{
printf("%d is big",d);
}
}
}
else if(b>c)
{
if(b>d)
{
printf("%d is big",b);
}
else
{
printf("%d is big",d);
}
}
else if(c>d)
{
printf("%d is big",c);
}
else
{
printf("%d is big",d);
}
getch();
}
main()
{
int a,b,c,d;
clrscr();
printf("Enter the Four Numbers :");
scanf("%d %d %d %d",&a,&b,&c,&d);
if(a>b)
{
if(a>c)
{
if(a>d)
{
printf("%d is big",a);
}
else
{
printf("%d is big",d);
}
}
}
else if(b>c)
{
if(b>d)
{
printf("%d is big",b);
}
else
{
printf("%d is big",d);
}
}
else if(c>d)
{
printf("%d is big",c);
}
else
{
printf("%d is big",d);
}
getch();
}
Output:
Enter
four numbers : 12 11 15 19
19
is big
13.To add,subtract,multiply,divide using switch
statement.
Program:
# include <stdio.h>int main(){ char o; float num1,num2; printf("Enter operator either + or - or * or divide : "); scanf("%c",&o); printf("Enter two operands: "); scanf("%f%f",&num1,&num2); switch(o) { case '+': printf("%.1f + %.1f = %.1f",num1, num2, num1+num2); break; case '-': printf("%.1f - %.1f = %.1f",num1, num2, num1-num2); break; case '*': printf("%.1f * %.1f = %.1f",num1, num2, num1*num2); break; case '/': printf("%.1f / %.1f = %.1f",num1, num2, num1/num2); break; default: /* If operator is other than +, -, * or /, error message is shown */ printf("Error! operator is not correct"); break; } return 0;}
Output:
Enter operator either + or - or * or divide : -
Enter two operands: 3.4
8.4
3.4 - 8.4 = -5.0
14.WAP
to swap two numbers using with and without third variable.
a)Program:
#include<stdio.h>
void swap(int*,int*);
int main()
{
int x, y;
printf("Enter the value of x and y\n");
scanf("%d%d",&x,&y);
printf("Before Swapping\nx = %d\ny = %d\n", x, y);
swap(&x,&y);
printf("After Swapping\nx = %d\ny = %d\n", x, y);
return0;
}
void swap(int*a,int*b)
{
int temp;
temp =*b;
*b =*a;
*a = temp;
}
Output:
Enter the
value of x and y
12
13
Before
swapping
X=12
Y=13
After
swapping
X=13
Y=12
b)Program:
#include<stdio.h>
int main() {
int a, b;
printf("\nEnter value for num1
& num2 : ");
scanf("%d %d", &a,
&b);
a = a + b;
b = a - b;
a = a - b;
printf("\nAfter swapping value
of a : %d", a);
printf("\nAfter swapping value
of b : %d", b);
return (0);
}
Output:
Enter value for num1 & num2 : 10 20
After swapping value of a : 20
After swapping value of b : 10
15.WAP to print a counting from 1 to 100 using
a)for loop
b)while loop
c)do while loop
a)Program:
#include<stdio.h>
int main()
{
int n;
for(n=1;n<=100;n++)
for(n=1;n<=100;n++)
printf(“%d “ “ ”,n);
return
0;
}
b)Program:
#include<stdio.h>
int main()
{
int n=1;
while(n<=100)
while(n<=100)
printf(“%d “ “ ”,n);
return
0;
}
c)Program:
#include<stdio.h>
int main()
{
int n=1;
do
{ printf(“%d “ “ ”,n);
n++;
}while(n<=100);
do
{ printf(“%d “ “ ”,n);
n++;
}while(n<=100);
return
0;
}
Output:
1
2 3 4 5 ……….. 98 99 100
16.To
print the table of given numbers using while/do while loop .
Program:
#include<stdio.h>
#include<conio.h>
voidmain()
{
inti=2,m,n;
printf("enternumber");
scanf("%d",&n);
do
{
m=i*n;
printf("%d*%d=%d\n",n,i,m);
i=i+1;
}
while(i<=10);
voidmain()
{
inti=2,m,n;
printf("enternumber");
scanf("%d",&n);
do
{
m=i*n;
printf("%d*%d=%d\n",n,i,m);
i=i+1;
}
while(i<=10);
getch();
}
Output:
enter number 9
9 * 1 = 9
9 * 2 = 18
9 * 3 = 27
9 * 4 = 36
9 * 5 = 45
9 * 6 = 54
9 * 7 = 63
9 * 8 = 72
9 * 9 = 81
9 * 10 = 90
17.To
print a factorial of a number:
Program:
#include <stdio.h>int main(){ int n, count; unsigned long long int factorial=1; printf("Enter an integer: "); scanf("%d",&n); if ( n< 0) printf("Error!!! Factorial of negative number doesn't exist."); else { for(count=1;count<=n;++count) /* for loop terminates if count>n */ { factorial*=count; /* factorial=factorial*count */ } printf("Factorial = %lu",factorial); } return 0;}
Output
1:
Enter an integer: -5
Error!!! Factorial of negative number doesn't exist.
Output 2:
Enter an integer: 10
Factorial = 3628800
18.
To print pyramid for different patterns using for loop.
Program:
#include<stdio.h>
int main()
{
int i,j,rows;
printf("Enter the number of rows: ");
scanf("%d",&rows);
for(i=1;i<=rows;++i)
{
for(j=1;j<=i;++j)
{
printf("* ");
}
printf("\n");
}
return 0;
}
Output:
*
* *
* * *
* * * *
* * * * *
19.To
swap two numbers using call by value & call by reference.
a)Program:
#include<stdio.h>
void swap(int*,int*);
int main()
{
int x, y;
printf("Enter the value of x and y\n");
scanf("%d%d",&x,&y);
printf("Before Swapping\nx = %d\ny = %d\n", x, y);
swap(&x,&y);
printf("After Swapping\nx = %d\ny = %d\n", x, y);
return0;
}
void swap(int*a,int*b)
{
int temp;
temp =*b;
*b =*a;
*a = temp;
}
Output:
Enter the
value of x and y
12
13
Before
swapping
X=12
Y=13
After
swapping
X=13
Y=12
b)Program:
#include<stdio.h>
void swap(int,int);
int main()
{
int x, y;
printf("Enter the value of x and y\n");
scanf("%d%d",&x,&y);
printf("Before Swapping\nx = %d\ny = %d\n", x, y);
swap(x,y);
return0;
}
void swap(int a,int b)
{
int temp;
temp =b;
b =a;
a = temp;
printf("After Swapping\nx = %d\ny = %d\n", x, y);
}
Output:
Enter the
value of x and y
12
13
Before
swapping
X=12
Y=13
After
swapping
X=13
Y=12
20.To print the sum of first n natural numbers by
using recursion.
Program:
#include<stdio.h>int
add(int n);int main(){ int n; printf("Enter an positive integer: "); scanf("%d",&n); printf("Sum = %d",add(n)); return 0;}int add(int n){ if(n!=0) return n+add(n-1); /* recursive call */}
Output:
Enter an positive integer: 10
Sum = 210
21)To display
the biggest value in an integer array.
Program:
#include <stdio.h>
int main(){
int i,n;
float arr[100];
printf("Enter total number of
elements(1 to 100): ");
scanf("%d",&n);
printf("\n");
for(i=0;i<n;++i) /* Stores number entered by user. */
{
printf("Enter Number %d:
",i+1);
scanf("%f",&arr[i]);
}
for(i=1;i<n;++i) /* Loop to store largest number to arr[0] */
{
if(arr[0]<arr[i]) /* Change < to
> if you want to find smallest element*/
arr[0]=arr[i];
}
printf("Largest element =
%.2f",arr[0]);
return 0;
}
Output:
Enter total number of elements(1 to 100): 5
Enter Number 1: 54
Enter Number 2: 65
Enter Number 3: 45
Enter Number 4: 78
Enter Number 5: 99
Largest element =
99
22)To multiply two matrices using arrays.
Program:
#include
<stdio.h>
#include<conio.h>
void main()
{
int
a[3][3],b[3][3],c[3][3];
int i,j,k,l =
1,m = 2;
clrscr();
printf("----Enter
the first matrix A--------------\n");
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
gotoxy(l,m);
scanf("%d",&a[i][j]);
l =
l+6;
}
m
= m+1;
l=1;
}
printf("------------Enter
the first matrix B----\n")
m = m+1;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
gotoxy(l,m);
scanf("%d",&b[i][j]);
l =
l+6;
}
m = m+1;
l = 1;
}
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
c[i][j] = 0;
for(k=0;k<3;k++)
{
c[i][j] += a[i][k] * b[k][j];
}
}
}
printf("\n\n--The productof two matrix------ \n\n" );
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf("\t%d\t",c[i][j]);
if(j==2)
{
printf("\n\n");
}
}
}
getch();
}
OUTPUT:
---------------Enter
the first matrix A--------------
1 2
3
2 3
4
3 4 5
---------------Enter the first matrix B--------------
1 2
3
3 4
5
2 3
4
----------The
product of two matrix---------------
13 19 25
19 28 37
25 37 49
23)To concatenate two strings & store the result in
the third string.
Program:
#include <stdio.h>
#include <conio.h>
#include <string.h>
void main(){
char
str1[20],str2[20],str3[40]="";
int len,i,j;
clrscr();
printf("***StringsConcatination Function*****\n\n");
printf("Enter
string1: ");
scanf("%s",str1);
printf("Enter
string2: ");
scanf("%s",str2);
for(i=0,j=0;str1[i]!='\0';i++,j++)
str3[j] = str1[i];
for(i=0;str2[i]!='\0';i++,j++)
str3[j] = str2[i];
str3[j] = '\0';
len = j;
printf("\n\nAfter Concatination : %s",str3);
printf("\n\nLength of concated string is %d",len);
getch();
}
Output:
******Strings
Concatination Function*******
Enter
string1: saiteja
Enter
string2: Nagamothu
After Concatenation : Saiteja Nagamothu
Length
After concated string is 16
24)To check whether the string is a
palindrome without using string inbuilt functions.
Program:
#include
<stdio.h>
#include
<string.h>
int
main()
{
char text[10];
int begin, middle, end, length = 0;
printf(“enter a string:”);
gets(text);
while ( text[length] != '\0' )
length++;
end = length - 1;
middle = length/2;
for( begin = 0 ; begin < middle ; begin++
)
{
if ( text[begin] != text[end] )
{
printf("Not a palindrome.\n");
break;
}
end--;
}
if( begin == middle )
printf("Palindrome.\n");
return 0;
}
Output:
enter a string:
wow
Palindrome
25) To check whether the string is a
palindrome with using string inbuilt functions.
Program:
#include
<stdio.h>
#include
<string.h>
int
main()
{
char a[10], b[10];
printf("Enter the string to check if it
is a palindrome\n");
gets(a);
strcpy(b,a);
strrev(b);
if( strcmp(a,b) == 0 )
printf("Entered string is a
palindrome.\n");
else
printf("Entered string is not a
palindrome.\n");
return 0;
}
Output:
enter a string:
wow
Palindrome
26)To read &
print the record of 5 students using structures.
Program:
#include <stdio.h>
struct student{
char name[5];
int roll;
float marks;
};
int main(){
struct student s[5];
int i;
printf("Enter information of
students:\n");
for(i=0;i<5;++i)
{
s[i].roll=i+1;
printf("\nFor roll number
%d\n",s[i].roll);
printf("Enter name: ");
scanf("%s",s[i].name);
printf("Enter marks: ");
scanf("%f",&s[i].marks);
printf("\n");
}
printf("Displaying information of
students:\n\n");
for(i=0;i<5;++i)
{
printf("\nInformation for roll number
%d:\n",i+1);
printf("Name: ");
puts(s[i].name);
printf("Marks:
%.1f",s[i].marks);
}
return 0;
}
Output:
Enter information of students:
For roll number :1
Enter name: teja
Enter marks: 98
For roll number :2
Enter name: shanu
Enter marks: 89
For roll number :3
Enter name: sahib
Enter marks: 80
For roll number :4
Enter name: srilekha
Enter marks: 99
For roll number:5
Enter name: prudhvi
Enter marks: 75
Displaying information of students:
Information for roll number 1:
Name: teja
Marks: 98
Information for roll number 2:
Name: sahnu
Marks: 89
Information for roll number 3:
Name: sahib
Marks: 80
Information for roll number 4:
Name: srilekha
Marks: 99
Information for roll number 5:
Name: prudhvi
Marks: 75
27)To implement the concept of union
Program:
#include <stdio.h>
#include <conio.h>
void main()
{
union number
{
int n1;
float n2;
};
union number x;
clrscr()
;
printf("Enter
the value of n1: ");
scanf("%d", &x.n1);
printf("Value of n1 =%d",
x.n1);
printf("\nEnter
the value of n2: ");
scanf("%d", &x.n2);
printf("Value of n2 =
%d\n",x.n2);
}
Output:
Enter the value of n1:2
Value of n1 =2
Enter the value of n2:2.1234
Value of n2 =2.1234
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