//ex1.cpp #include <stdio.h> int main(){ int a=5,b=7,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; }
//ex2.cpp #include<stdio.h> int main(){ int x=1234; float f=123.456; double m=123.456; char ch='a'; char a[]="Hello,world!"; int y=3,z=4; 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("%3c\n",ch); printf("%s\n%15s\n%10.5s\n%2.5s\n%.3s\n",a,a,a,a,a); return 0; }
//ex3.cpp #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("%f,%lf",&x,&y); printf("%f,%lf\n",x,y); return 0; }
//ex4.cpp //判断字符类型 #include<stdio.h> int main(){ char x; x = getchar(); if(x>='0'&&x<='9') printf("x是数字字符\n",x); else if(x>='a'&&x<='z'||x>='A'&&x<='Z') printf("x是英文字母\n",x); else printf("x是其他字符\n",x); return 0; }
//ex5.cpp #include<stdio.h> int main(){ char ans1,ans2; printf("复习了没?(输入y或Y表示复习了,输入n或N表示没有复习):"); ans1=getchar(); getchar(); printf("\n动手敲代码了没?(输入y或Y表示敲了,输入n或N表示没有敲):"); ans2=getchar(); if(ans1=='y'||'Y'&&ans2=='y'||'Y') printf("\n罗马不是一天建成的:)\n"); else printf("\n罗马不是一天毁灭的。。。\n"); return 0; }
//ex6.cpp #include<stdio.h> #include<math.h> int main(){ int n,q,s,a1; scanf("%d",&n); q=2,a1=1; s=a1*(1-pow(q,n))/(1-q); printf("s=%d\n",s); return 0; }