作业2
//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; }
2.
//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("%lf\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("%lf,%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>=48&&x<=57) printf("%c是数字字符\n",x); else if(x>=65&&x<=90 ||x>=97&&x<=122) printf("%c是英文字母\n",x); else printf("%c是其它字符\n",x); return 0; }
//ex5.cpp #include <stdio.h> int main(){ char ans1, ans2; printf("复习了没?(输入y或者Y表示复习了,输入n或者N表示没复习) : "); ans1 = getchar(); getchar(); printf("敲代码了没?(输入y或者Y表示敲了,输入n或者N表示木有敲) : "); ans2 = getchar(); if((ans1=='y'||ans1=='Y')||(ans2=='y'||ans2=='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; }
//等比数列的求和 #include <stdio.h> #include <math.h> int main(){ int n; long sum; scanf("%d",&n); sum =pow(2,n)-1; printf("n = %ds时,sum = %d",n,sum); }