#include <stdio.h>
#include <stdlib.h>
int main()
{
    int inputA, inputB;
    printf("Input the first number(char):\n");
    scanf("%c", &inputA);
    printf("inputA = %d.\n", inputA);
    printf("Input the second number(char):\n");
    scanf("%c", &inputB);
    printf("inputB = %d.\n", inputB);
    getchar();
    return 0;
}

#include <stdio.h>
int main()
{
    int inputA, inputB;
    int flag = 1;  /*标记是否输入类型匹配要求*/
    printf("Input the first number(int):\n");
    flag = scanf("%d", &amp;inputA);  /*scanf获得的值类型不匹配时返回0.*/
    /*如果输入类型不匹配，或者输入中含有非法字符时要求重输.第一次输入错时会要求继续按一个回车，第二次则不再需要.*/
    while(flag == 0 || getchar() != '\n')
    {
        setbuf(stdin, NULL);    /* Linux系统中用以清空缓冲区的函数.*/
        while (getchar() != '\n'); /*循环读取缓冲区中的字符*/
        printf("Input type error,please enter again: ");
        flag = scanf("%d", &amp;inputA);
    }
    printf("inputA = %d.\n", inputA);
    printf("Input the second number(int):\n");
    flag = scanf("%d", &amp;inputB);
    while(flag == 0 || getchar() != '\n')
    {
        setbuf(stdin, NULL);
        while (getchar() != '\n');
        printf("Input type error,please enter again: ");
        flag = scanf("%d", &amp;inputB);
    }
    printf("inputB = %d.\n", inputB);
    getchar();
    return 0;
}

fflush(stdin);

#include <iostream>
int main()
{
    using namespace std;
    cout <<"Input the first number(int):\n";
    int inputA;
    /* 如果输入数据的类型不匹配，或者输入中含有非法字符，则清空缓存区并要求重输.*/
    while(!(cin >>inputA) || cin.get() != '\n')
    {
        cout <<"Input type error,please enter again: ";
        /*下面两句搭在一起使用可以有效清空缓存区.*/
        cin.clear();
        while(cin.get()!='\n')
            continue;
    }
    cout <<"\tinputA = "<<inputA<<endl;
        while(!(cin="">>inputB) || cin.get() != '\n')
    {
        cout <<"Input type error,please enter again: ";
        cin.clear();
        while(cin.get()!='\n')
            continue;
    }
    cout <<"\tinputB = "<<inputB<<endl;
    return 0;
}

cin.clear();
fflush(stdin);