< Let Us GCC 
 
 
        
      Old Code
/* Calculation of simple interest */
/* Author gekay Date 25/05/2004 */
main( )
{
    int p, n ;
    float r, si ;
    printf ( "Enter values of p, n, r" ) ;
    scanf ( "%d %d %f", &p, &n, &r ) ;
    
    si = p * n * r / 100 ;
    printf ( "%f" , si ) ;
}
New Code
/* Calculation of simple interest */
/* Author gekay Date 25/05/2004 */
/* Editor GReaperEx Date 19/7/2015 */
#include <stdio.h>
int main(void)
{
    int p, n ;
    float r, si ;
    printf("Enter values of p, n, r");
    scanf("%d%d%f", &p, &n, &r);
    si = p*n*r/100 ;
    printf("%f", si);
}
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