4-8.2

#include<stdio.h>
int main(void)
{
    int mark,max;

    printf("Enter marks:");
    scanf("%d",&mark);
    max = mark;
    while(mark>=0){
        if(max < mark)
            max = mark;
        scanf("%d",&mark);
    };
    printf("Max=%d\n",max);

    return 0;
}