C数据类型

#include <iostream>
#include <cstdlib>

int main() {

    // 基础
    int a = 5;
    int b = 2;
    float c = a / b;
    printf("%f\n", c);
    // 在printf中计算会出现意想不到的问题
    printf("%f\n", (a/b));

    float f = a / (2.0);
    printf("%f\n", f);

    printf("------\n");
    char d = 253;
    // 回忆补码，原码，真值那些往事
    printf("%d\n", d);

    // below is right
    unsigned char e = 253;
    printf("%d\n", e);

    return 0;
}