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1.#include<stdio.h>#include<st 1. #include<stdio.h> #include<stdlib.h> #include<math.h> int main() { double x,y; scanf("%lf",&x); if(x!=0) { if(x<1) y=log10(x); else if(x<6) y=sqrt(2*x+3); else y=pow(x,5.0)+pow(x,3.0)*3; printf("y=%.4lf\n",y); } else printf("error!\n"); system("pause"); return 0; } 2. #include <stdio.h> #include<stdlib.h> int main() { float x,y,z; char f; scanf("%f%c%f",&x,&f,&y); switch(f) { case '+':z=x+y;break; case '-':z=x-y;break; case '*':z=x*y;break; case '/':if(y==0)printf("出错，除数为零？\n");else z=x/y;break; default:printf("不是四则运算式\n");break; } if(!(f=='/'&&y==0)&&(f=='+'||f=='+'||f=='-'||f=='*'||f=='/')) printf("%.2f%c%.2f=%.4f\n",x,f,y,z); system("pause"); return 0; } 3. #include<stdio.h> #include<stdlib.h> int main() { int t; scanf("%d",&t); if(t>0) { switch(t%7) { case 0:printf("星期日\n");break; case 1:printf("星期一\n");break; case 2:printf("星期二\n");break; case 3:printf("星期三\n");break; case 4:printf("星期四\n");break; case 5:printf("星期五\n");break; case 6:printf("星期六\n");break; default:break; }}else printf("错误!请重新运行程序!\n"); system("pause"); return 0; }
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