How to find the maximum and minimum values ​​using pointers in C language

Problem description: How to find the maximum and minimum value using C language pointers

The following is a simple one example, used to illustrate pointer variables pointing to functions. Define two functions max and min to find the maximum and minimum values ​​respectively. In the main function, the pointer variable points to the max function or the min function according to whether the number entered by the user is 1 or 2.

codes:#include <stdio.h>int main(){
    int max(int,int);//求最大值函数声明 
    int min(int,int);//求最小值函数声明 
    int (*p)(int,int);//定义指向函数的指针变量 
    
    int a,b,c,n;
    printf("please input two numbers:");//输入两个数 
    scanf("%d%d",&a,&b);
    printf("please choose 1 or 2:");//输入1 or 2 
    scanf("%d",&n);
    if(n == 1){ //如果输入1则使 p 指向max函数 
        p = max;
    }
    else if(n == 2){    //如果输入2，使p指向min函数 
        p = min;
    }
    
    c = (*p)(a,b);
    printf("a = %d, b = %d\n",a,b);
    
    if(n == 1){
        printf("max = %d\n",c);
    }
    else{
        printf("min = %d\n",c);
    }
    return 0;}int max(int x, int y)   //求最大值函数 {
    return x > y ? x : y;} int min(int x, int y)   //求最小值函数 {
    return x < y ? x : y;}

Recommended tutorial: "c Language Tutorial"

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