100% total of marks of a student in 4 subjects using array concept

//program to find total of  marks of 4 subjects of a student using array concept
#include <stdio.h>
void main()
{
     int i,marks[4],total=0;
     for(i=0;i<4;i++)
     {
       printf("\n enter the marks in subject %d:",i+1);
       scanf("%d",&marks[i]);
       total=total+marks[i];
     }
       printf("\n sum of the marks of 4 subjects =%d",total);    
}

output  తెర మీద ఇలా  

enter the marks in subject 1:20
enter the marks in subject 2:21
enter the marks in subject 3:19
enter the marks in subject 4:21
sum of the marks of 4 subjects =81