做業題：輸出單個字符 輸入單個字符 scanf printf

輸出單個字符用putchar()

#include <iostream>
using namespace std;

int main(){
    
    char x='B';
    char y='O';
    char z='Y';
    putchar(x);//至關於cout輸出一個字符 
    putchar(y);
    putchar(z);
    putchar('\n');
    putchar(66);
    putchar(79);
    putchar(89);
    putchar(10);
    
    return 0;
}

輸入輸出單個字符

#include <iostream>
using namespace std;

int main(){
    
    char z;
    z=getchar();//至關於cout輸出一個字符 
    putchar(z);
    putchar('\n');
    putchar(z+32);
    
    return 0;
}

scanf printf

#include <iostream>
using namespace std;

int main(){
    
    char c='A';
    scanf("%c",&c);//scanf輸入時變量名加&地址運算符 
    printf("%c",c);//printf的輸出格式 
    
    return 0;
}