#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; }
a乘b除以c,a乘c除以b,c除以b乘a
运算的先后顺序不同
#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; }
%d:输出整型;%8d输出整型,并占8位字符;%f:输出浮点型;%lf:输出长整型 %8.1f:保留小数后一位并占八位;%c:输出字符型;%s:输出字符串
#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("%.1f,%.1lf\n",x,y); return 0; }
#include <stdio.h> int main() { char x; x = getchar(); if(x<='9'&&x>='0') printf("%c是数字字符\n", x); else if(x<='z'&&x>='a'||x>='A'&&x<='Z') printf("%c是英文字母\n", x); else printf("%c是其它字符\n", x); return 0; }
#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表示木有敲) : "); ans2 = getchar(); if(ans1=='Y'&&ans2=='Y'||ans1=='y'&&ans2=='y'||ans1=='Y'&&ans2=='y'||ans1=='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; }
#include <stdio.h> int main(){ int n,sum; int i = 1; int p = 1; scanf("%d",&n); while(i<=(n+1)){ p = p*2; i++; } sum = 1*(1-p)/(1-2); printf("n = %d时,sum = %d",n,sum); return 0; }