C语言入门学习和整理 1-3

1.

int main() {
    char c = 'A';
    printf("c=%c", c);
}

int main() {
    char c = 65;
    printf("c=%c", c);
}

 这两个结果相同 都是c=A

但如果都以%d的格式输出

int main() {
    char c = 65;
    printf("c= %d", c);
}

int main() {
    char c = 'A';
    printf("c=%d", c);
}

则结果为c= 65

但如果

int main() {
    char c;
    c = 200;
    printf("c=%d", c);
}

则 c=-56

int main() {
    unsigned char c;
    c = 200;
    printf("c=%d", c);
}

则c=200