学习笔记（51):C语言入门到精通-char类型

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#include <stdio.h>

int main() {
    char x = '\0';
    int diff = 'a' - 'A';

    printf("please input a char: ");
    scanf("%c", &x);

    if (x >= 'A' && x <= 'Z') {
        printf("%c\n", x + diff);
    } else if (x >= 'a' && x <= 'z') {
        printf("%c\n", x - diff);
    } else {
        printf("%c\n", x);
    }

    return 0;
}


#include <stdio.h>

int main() {
    unsigned int score = 0;
    char grade = '\0';

    printf("please input your score: ");
    scanf("%d", &score);

    if (score >= 90) {
        grade = 'A';
    } else if (score >= 60) {
        grade = 'B';
    } else {
        grade = 'C';
    }

    printf("%c\n", grade);

    return 0;
}

#include <stdio.h>

int main() {
    char x = 'a';

    while (x <= 'z') {
        printf("%d ", x++);
    }

    printf("\n=================\n");

    x = 'A';
    while (x <= 'Z') {
        printf("%d ", x++);
    }

    printf("\n=================\n");

    x = '0';
    while (x <= '9') {
        printf("%d ", x++);
    }

    return 0;
}