实验一（18网三43号）

#include<stdio.h>
int main()
{
    int a,b,sum;
    a=123;
    b=456;
    sum=a+b;
    printf("sum is %d\n",sum);
    return 0;
}

#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;
}

#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;
}

#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;
}