C语言学生成绩加权计算程序输入异常问题排查求助

架构老林

2026-10-4

问题解决

你遇到的所有输入异常都是因为scanf格式字符串末尾多写了\n导致的：
scanf中的空白字符（空格、换行符\n、制表符\t等）会触发连续跳过所有后续输入的空白内容，直到匹配到非空白字符才会终止当前输入流程。所以你输入完对应数量的成绩后，程序不会立刻执行后续逻辑，必须额外输入一个非空白内容才会继续，这就是你遇到两个问题的核心原因。

具体修改方案

把代码中所有scanf语句格式字符串末尾的\n全部删除即可，修改后的完整代码如下：

#include <stdio.h>

int main()
{
    int testOne,testTwo,testPoint,totTest;
    float percTest;
    printf("Enter you test grades:\n");
    scanf("%d%d",&testOne,&testTwo);
    totTest=testOne+testTwo;
    printf("Your total grade points is: %d\n", totTest);
    testPoint=200;
    percTest=(totTest*.40)/testPoint *100;
    printf("Your percentage is %.1f%%\n", percTest);

    int quizOne,quizTwo,quizThree,quizFour,quizPoint,totQuiz;
    float percQuiz;
    printf("Enter you quiz grades:\n");
    scanf("%d%d%d%d",&quizOne,&quizTwo,&quizThree,&quizFour);
    totQuiz=quizOne+quizTwo+quizThree+quizFour;
    printf("Your total quiz grade is %d\n", totQuiz);
    quizPoint=400;
    percQuiz=(totQuiz*.30)/quizPoint *100;
    printf("Your quiz percentage is %.1f%%\n", percQuiz);
    
    int examOne,examPoint;
    float percExam,finGrade;
    printf("Enter your exam grade:\n");
    scanf("%d",&examOne);
    printf("Your total exam points is: %d\n", examOne);
    examPoint=100;
    percExam=(examOne*.30)/examPoint *100;
    printf("Your final exam grade is %.1f\n", percExam);
    
    finGrade=(percExam+percQuiz+percTest);
    printf("Your overall grade is %.1f%%\n", finGrade);

    return 0;
}