C programming examples with output Example 1 - C hello world program /** My first C program */ #include <stdio.h> int main ( ) { printf ( "Hello World \n " ) ; return 0 ; } Output of program: "Hello World" Example 2 - C program to get input from a user using scanf #include <stdio.h> int main ( ) { int x ; printf ( "Input an integer \n " ) ; scanf ( "%d" , & x ) ; // %d is used for an integer printf ( "The integer is: %d \n " , x ) ; return 0 ; } Output: Input an integer 7897 The integer is: 7897 Example 3 - using if else control instructions #include <stdio.h> int main ( ) { int n ; printf ( "Enter a number \n " ) ; scanf ( "%d" , & n ) ; if ( n > 0 ) printf ( "Greater than zero. \n " ) ; else printf ( "Less than or equal to zero. \n " ) ; return 0 ; } Output: Enter a number -45 Less than or eq