int main() {
int num;
scanf("%d", &num);
printf("2049%04d\n", num);
scanf("%d", &num);
printf("2049%04d\n", num);
scanf("%d", &num);
printf("2049%04d\n", num);
return 0;
}
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;
}
#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("%lf,%lf\n",x,y);
return 0;
}
#include <stdio.h>
int main() {
char ans1, ans2;
printf("复习了没?");
ans1 = getchar();
getchar();
printf("\n动手敲代码了没? ");
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() {
char x;
x = getchar();
if(x<'9'&&x>'0')
printf("%c是数字字符\n", x);
else if( 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>
#include<math.h>
int main()
{
int n;
double sum,q,i;
q=2.0;
sum=1;
scanf("%d",&n);
for(i=1;i<=n;i++)
sum=sum+pow(q,i);
printf("n=%d时,sum=%.0f",n,sum);
return 0;
}