题解 | 学生基本信息输入输出

#include <stdio.h>
#include<math.h>
int main() {
    float a, b, c;
    int id;
    scanf("%d;%f,%f,%f", &id, &a, &b, &c);
    a = roundf(a * 100) / 100; 
    b = roundf(b * 100) / 100;
    c = roundf(c * 100) / 100;
    printf("The each subject score of No. %d is %.2f, %.2f, %.2f.", id, a, b, c);
    return 0;
}

roundf()函数四舍五入，先放大，再舍入更精准，其实也是无奈之举。下面这个总有四舍五入过不了╮(╯▽╰)╭

#include <stdio.h>

int main() {
    float a, b, c;
    int id;
    scanf("%d;%f,%f,%f", &id, &a, &b, &c);
    printf("The each subject score of No. %d is %.2f, %.2f, %.2f.", id, a, b, c);
    return 0;
}