C语言里不为人知的秘密(01)之常见使用

01)C语言中运算符sizeo

    printf("%d \n", sizeof(short));
    printf("%d \n", sizeof(int));
    printf("%d \n", sizeof(long));
    printf("%d \n", sizeof(float));
    printf("%d \n", sizeof(double));
    printf("%d \n", sizeof(char));

 02)遍历26个英文字母

使用 putchar 和 printf

    char ch;
    for(ch = 'A' ; ch <= 'Z' ; ch++) {
        putchar(ch);
    }

    printf("\n");
    for(ch = 'A' ; ch <= 'Z' ; ch++) {
        printf("%c",ch);
    }