C语言不懂怎么运算，有很多前提不明白

Question

```c

#include <stdio.h>
int main()
{
int a = 2;
char b = ‘A’; // ‘A’==65
float c = 1.5;
double d = 3.1415926;
float x;

x = a+b+c+d;
c = a/3;
b = b+1;
d = daa;
printf(“%c,%f,%lf\n”, b, c, d);
return 0;
}

```这些都是怎么算的啊

Answer 1

供参考：

#include <stdio.h>
int main()
{
    int a = 2;
    char b = 'A'; // ‘A’==65
    float c = 1.5;
    double d = 3.1415926;
    float x;

    x = a + b + c + d;
    c = a / 3;
    b = b + 1;
    d = d * a * a;
    printf("%c, %f, %lf, %f\n", b, c, d, x);
    return 0;
}