C语言输入与输出

1.输出字符和字符串

#include <iostream>

int main() {

    putchar(80);
    char ch = 'A';
    putchar(ch);

    puts("Hello World!\n");

    char str[] = "Hello Clion";
    puts(str);
    return 0;
}

2.格式化输出

#include <stdio.h>

int main() {

    printf("Number:%d,Unsigned Int:%u\n",12,23);//%u 无符号数字 不能写负数

    printf("%o\n",8);//%o 八进制

    printf("%x,%X,red:%X\n",15,15,0xFFFF0000);//0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,10  十六进制

    printf("%.2f\n",3.14);//%.2f 保留两位小数

    printf("%c\n",'A');//字符

    printf("%s\n","Hello World!");//字符串

    printf("%03d",7);//%03至少三位有效数字 7---> 007  70---> 070  700---> 700  7000---> 7000

    return 0;
}

3.输入字符

#include <iostream>


int main() {

    puts("please input a char");
    char inputChar = getchar();
    printf("User input is %c\n", inputChar);

    return 0;
}

4.格式化输入

#include <iostream>


int main() {

    char dist;
    printf("please input a char \n");
    scanf("%c", &dist);
    printf("User input char is %c\n", dist);

    int a;
    printf("please input a number\n");
    scanf("%d", &a);
    printf("User input number is %d\n", a);

    char buf[100];
    printf("Please input a string\n");
    scanf("%s", buf);
    printf("User input string is : %s\n", buf);

    return 0;
}