可变参数实践

#include <iostream>
#include <stdarg.h>
#include <stdio.h>


using namespace std;

//============================================================================
//总结：
//============================================================================


void fun(int paramCount, ...){
    cout<<"参数个数："<<paramCount<<endl;

    va_list params;
    va_start(params, paramCount);

    while(paramCount--){

        char* strParam = va_arg(params, char*);
        int intParam = va_arg(params, int);
        cout<< strParam << endl;
        cout<< intParam << endl;
    }
    va_end(params);
}


void print11(const char *format, ...)
{
    va_list arg;
    va_start(arg, format);

    while (*format)
    {
        char ret = *format;
        if (ret == ‘%‘)
        {
            switch (*++format)
            {
            case ‘c‘:
            {
                        char ch = va_arg(arg, char);
                        putchar(ch);
                        break;
            }
            case ‘s‘:
            {
                        char *pc = va_arg(arg, char *);
                        while (*pc)
                        {
                            putchar(*pc);
                            pc++;
                        }
                        break;
            }
            default:
                break;
            }
        }
        else
        {
            putchar(*format);
        }
        format++;
    }
    va_end(arg);
}

int main(){

    cout << "函数可变参数实践：" << endl;

    // 2指2对参数
    fun(2,"Welcome1:",1,"Welcome2:",2);


    print11("%s %s %c%c%c%c%c!\n", "welcome", "to", ‘C‘, ‘h‘, ‘i‘, ‘n‘, ‘a‘);


    cout << "end." << endl;

    return 0;
}