#include<stdio.h>
int main()
{
int a,b,sum;
a=123;
b=456;
sum=a+b;
printf("sum is %d\n",sum);
return 0;
}
![](https://img2018.cnblogs.com/blog/1617828/201904/1617828-20190411140622473-712940970.png)
#include<stdio.h>
int main()
{
char c1,c2;
c1=97;
c2=98;
printf("c1=%c,c2=%c\n",c1,c2);
printf("c1=%d,c2=%d\n",c1,c2);
return 0;
}
![](https://img2018.cnblogs.com/blog/1617828/201904/1617828-20190411141206132-355243338.png)
#include<stdio.h>
int main()
{
char c1,c2;
c1=197;
c2=198;
printf("c1=%c,c2=%c\n",c1,c2);
printf("c1=%d,c2=%d\n",c1,c2);
return 0;
}
![](https://img2018.cnblogs.com/blog/1617828/201904/1617828-20190411141717696-1694487002.png)
#include<stdio.h>
#include<math.h>
int main()
{
double x,y,z;
printf("请输入两个数:\n");
scanf("%lf%lf",&x,&y);
z=x+1/fabs(y);
printf("%d\n",(int)z);
printf("%15.6f\n",z);
printf("%e\n",z);
return 0;
}
![](https://img2018.cnblogs.com/blog/1617828/201904/1617828-20190411145853496-568376680.png)