新手自学，遇到问题求教

#include <stdio.h>
int main( void )
{
int integer1, integer2, sum;
printf( "Enter first integer\n" );
scanf( "%d", &integer1 );
printf( "Enter second integer\n" );
scanf( "%d", &integer2 );
sum = integer1 + integer2;
printf( "Sum is %d\n" , sum );
return 0;
}