c语言中如何求数据类型

可以使用sizeof运算符来求数据类型的大小，如：

#include <stdio.h>

int main() {
    printf("Size of int: %d bytes\n", sizeof(int));
    printf("Size of float: %d bytes\n", sizeof(float));
    printf("Size of double: %d bytes\n", sizeof(double));
    printf("Size of char: %d bytes\n", sizeof(char));
    return 0;
}

输出结果：

Size of int: 4 bytes
Size of float: 4 bytes
Size of double: 8 bytes
Size of char: 1 bytes