目录

题目及要求

 涉及到的知识点

代码示例

运行实例

题目及要求

编写程序，定义和调用如下函数:
double add(double x,double y);
double sub(double x, double y);
double mul(double x, double y);
double div(double x, double y);
求两个浮点数的和、差、积、商，要求通过函数指针回调函数。一行中输人两个浮点数，以空格间隔。分行输出两个浮点数的和、差、积、商。

 涉及到的知识点

【C语言程序涉及】        指针

【编译软件】        Visual Studio

代码示例

#include <stdio.h>
double add(double, double);
double sub(double, double);
double mul(double, double);
double div(double, double);
int main(void) {
    double num1, num2, result;
    double (*pf)(double, double);
    scanf_s("%lf%lf", &num1, &num2);        //        编译软件是Dev c++则要把_s去掉
    pf = add;
    result = pf(num1, num2);
    printf("%lfn", result);
    pf = sub;
    result = pf(num1, num2);
    printf("%lfn", result);
    pf = mul;
    result = pf(num1, num2);
    printf("%lfn", result);
    pf = div;
    result = pf(num1, num2);
    printf("%lfn", result);
    return 0;
}

double add(double x, double y) {
    return x + y;
}
double sub(double x, double y) {
    return x - y;
}
double mul(double x, double y) {
    return x * y;
}
double div(double x, double y) {
    return x / y;
}

#include <stdio.h>
double add(double, double);
double sub(double, double);
double mul(double, double);
double div(double, double);
int main(void) {
    double num1, num2, result;
    double (*pf)(double, double);
    scanf_s("%lf%lf", &num1, &num2);
    pf = add;
    result = pf(num1, num2);
    printf("%lfn", result);
    pf = sub;
    result = pf(num1, num2);
    printf("%lfn", result);
    pf = mul;
    result = pf(num1, num2);
    printf("%lfn", result);
    pf = div;
    result = pf(num1, num2);
    printf("%lfn", result);
    return 0;
}

double add(double x, double y) {
    return x + y;
}
double sub(double x, double y) {
    return x - y;
}
double mul(double x, double y) {
    return x * y;
}
double div(double x, double y) {
    return x / y;
}

运行实例

最后

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