C语言四则运算计算器

Question

运算的结果根本不对 大家帮我看看吧 不知道那里出问题了

主函数代码

#include <stdio.h>

int main() {

    int x;
    float    a = 0, b = 0;
    printf("请输入功能前的数字)
");
    scanf_s("%d", &x);

    switch (x)
    {
    case 1: {
        printf("请输入要相加的数字");
        scanf_s("%f%f", &a, &b);
        float result = jiafa(a, b);
        printf("%f", result);
    }break;
    case 2: {
        printf("请输入要相减的数字");
        scanf_s("%f%f", &a, &b);
        float result = jianfa(a, b);
        printf("%f", result);
    }break;
    case 3: {
        printf("请输入要相乘的数字");
        scanf_s("%f%f", &a, &b);
        float result = chengfa(a, b);
        printf("%f", result);
    }break;
    case 4: {
        printf("请输入要相除的数字");
        scanf_s("%f%f", &a, &b);
        float result = chufa(a, b);
        printf("%f", result);
    }break;
    default:printf("选择功能错误 请重新选择");
        break;
    }

计算函数代码

#include <stdio.h>

float jiafa(float x, float y) {
    float sum;
    sum = x + y;
    return sum;
}

float jianfa(float x, float y) {
    float sum;
    sum = x - y;
    return sum;
}

float chengfa(float x, float y) {
    float sum;
    sum = x * y;
    return sum;
}

float chufa(float x, float y) {
    float sum;
    sum = x / y;
    return sum;
}

Answer 1

兄弟，你把chengfa（）中sum类型定义错了呀，应该也用float来定义。 望采纳~