实验2

#include <stdio.h>
int main() {
    int a=5, b=6, c=100, d, e, f;
    
    d=a/b*c;
    e=a*c/b;
    f=c/b*a;
    printf("d=%d, e=%d, f=%d\n",d,e,f);
    
    return 0;
} 

#include <stdio.h>
     int main(){
         
         int x=123.456;
         float f=123.456;
         double m=123.456;
         char ch='a';
         char a[]="hi world!";
         int y=4,z=5;
         
         printf("%d %d\n",y,z);
         printf("y=%d, z=%d\n",y,z);
         printf("%8d,%2d\n",x,x);
         printf("%f,%8f,%8.1f,%0.2f,%.2e\n",f,f,f,f,f);
         printf("1f\n",m);
         printf("%3d\n",ch);

#include <stdio.h>
int main()  {
    double x,y;
    char c1,c2,c3; 
    int a1,a2,a3;
    
    scanf("%d%d%d",&a1,&a2,&a3);
    printf("%d%d%d\n",a1,a2,a3);
    scanf("%c%c%c",&c1,&c2,&c3);
    printf("\'%c\'\'%c\'\'%c\'\n",c1,c2,c3);
    scanf("%lf,%lf",&x,&y);
    printf("%lf,%lf\n",x,y);
    
    return 0;
    
    
} 

#include <stdio.h>
int main() {
    char x;
    
    x = getchar();
    
    if(x>='a'&&x<='z')
    printf("%cis word character\n",x);
    else if(x>='0'&&x<='9')
    printf("%cis number character\n",x);
    else printf("%cis others",x);
    return 0;
} 

#include <stdio.h>
int main() {
    char ans1,ans2;
    
    printf("Have you reviewed? (y/Y is yes n is no):");
    ans1 = getchar();
    
    getchar();
    
    printf("\n手动敲代码？(y/Y is yes n is no):");
    ans2 = getchar();
    
    if (ans1=='y'||ans1=='Y'&&ans2=='y'||ans2=='Y')
       printf("\nRoma was not built in one day:)\n");
       else
       printf("\nRoma was not distroyed in one day...\n");
       return 0;
} 

#include <stdio.h>
#include<math.h>
      int main() {
          int n,sum;
          scanf("%d",&n);
          sum=pow(2,n)-1;
          printf("n=%d时,sum=%d\n",n,sum);
          return 0;
          
      } 

         printf("%s\n%15s\n%10.5s\n%2.5s\n%.3s\n",a,a,a,a,a);
         
         return 0;
     }