新思维：C语言程序设计

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   1   2   3   4   5
   2   4   6   8  10
   3   6   9  12  15
   4   8  12  16  20

1 2 3 4 5 2 4 6 8 10 3 6 9 12 15 4 8 12 16 20

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#include <stdio.h>
#define SUM 100000
int main()
{
    float amount,aver,total;
    int i;
    for (i=1,total=0; i<=1000; i++) {
        printf("please enter amount, student %4d = ", i);
        scanf("%f",&amount);
        total= total+amount;
        if (total>=SUM) break;
    }
    aver=total/i;
    printf("num=%dnaver=%10.2fn",i,aver);
    return 0;
}

#include <stdio.h> #define SUM 100000 int main() { float amount,aver,total; int i; for (i=1,total=0; i<=1000; i++) { printf("please enter amount, student %4d = ", i); scanf("%f",&amount); total= total+amount; if (total>=SUM) break; } aver=total/i; printf("num=%dnaver=%10.2fn",i,aver); return 0; }