#include <stdio.h>
#include <stdlib.h>
int main()
{
 int a=12;
 int b=100;
 float c=8.5;
 int m=a+b;
 float n=b*c;
 double p=a/c;
 int q=b%a;
 printf("m=%d, n=%f, p=%lf, q=%d\n", m, n, p, q);
 system("pause");
 return 0;
}

#include <stdio.h>
#include <stdlib.h>
int main()
{
 int a=12;
 int b=100;
 float c=8.9;
 int m=a-b; // 变量参与运算
 int n=a+239; // 有变量也有数字
 double p=12.7*34.3; // 数字直接参与运算
 printf("m=%d, n=%d, p=%lf\n", m, n, p);
 printf("m*2=%d, 6/3=%d, m*n=%ld\n", m*2, 6/3, m*n);
 system("pause");
 return 0;
}

#include <stdio.h>
#include <stdlib.h>
int main()
{
 int a=12;
 int b=10;
 printf("a=%d\n", a);
 a=a+8;
 printf("a=%d\n", a);
 a=a*b;
 printf("a=%d\n", a);
 system("pause");
 return 0;
}

int a = 10, b = 20;
a += 10; //相当于 a = a + 10;
a *= (b-10); //相当于 a = a * (b-10);
a -= (a+20); //相当于 a = a - (a+20);