标签:include EOF int scanf 实验 printf main
2.1------------------------------------------------------------------------- #include<stdio.h> #define EOF -1 int main() { int num; while(scanf("%d",&num)!=EOF) //不要加; { printf("2049%04d\n",num); //while加{} ,0即用0补齐 } return 0; } ------------------------------------------------------------------------------------ 2.2------------------------------------------------------------------------------- #include<stdio.h> int main() { int x=1234; float f=123.456; double m=123.456; char ch='a'; char a[]="Hello world!"; //[15]从第12个字符开始,后面均为\0,要加[] 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); //长度小于真实长度,照常输出 printf("%f,%8f,%8.1f,%.2f,%.2e\n",f,f,f,f,f); //前方的逗号仅仅就是输出时加个逗号 ,lf和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); //s的.几是取几个字符 前面是共占几个长度 return 0; } ----------------------------------------------------------------------------------- 2.3------------------------------------------------------------------------------ #include<stdio.h> int main() { double x,y; char c1,c2,c3; int a1,a2,a3; scanf("%d%d%d",&a1,&a2,&a3); //scanf前少& printf("%d,%d,%d\n",a1,a2,a3); scanf(" %c %c %c",&c1,&c2,&c3); //%c前加空格,可抵消掉回车占的字符 printf("%c,%c,%c\n",c1,c2,c3); scanf("%lf%lf", &x,&y);//scanf读%f时,按照四个字节读,double有8字节,要用lf printf("%f,%lf\n",x,y); return 0; } -------------------------------------------------------------------------------------- 2.4 #include<stdio.h> int main(){ char ans1,ans2; printf("Have you reviewed?(scan Y or y is yep; scan N or n is nope.):"); ans1=getchar(); getchar(); //要用enter键表示输入结束 printf("Have you scan your code by yourself?(scan Y or y is yep; scan N or n is nope.):"); ans2=getchar(); if((ans1=='Y'||ans1=='y')&&(ans2=='Y'||ans2=='y')) //别把==打成= printf("Rome is not built in one day\n"); else printf("Rome is not ruined in one day\n"); return 0; } --------------------------------------------------------------------------------------- 2.5 #include<stdio.h> #define EOF -1 int main() { char x; while((scanf(" %c",&x))!=EOF) { if(x>='0'&&x<='9') //判断字符的大小时不必加'' printf("%c是数字字符\n",x); else if(x>=97&&x<=122||x>=65&&x<=90) { printf("%c是英文字母\n",x); } else printf("%c是其它字符\n",x); } return 0; } ----------------------------------------------------------------------------------- 2.6 #include<stdio.h> #include<math.h> #define EOF -1 int main(){ int a1,n,s,q; q=2; a1=pow(q,0); while(scanf("%d",&n)!=EOF) //不需;且需{} { if(n>=1&&n<=10) { s=(int)(a1*(1-pow(q,n+1))/(1-q)); //n+1项 printf("n = %d 时, sum = %d\n",n,s); } else printf("i can't do it!"); } return 0; } ---------------------------------------------------------
标签:include,EOF,int,scanf,实验,printf,main 来源: https://www.cnblogs.com/nuistli/p/14604115.html
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