for(i=-100;i<=100;i=i+10)

{printf("%5d",ctof(i));

if (n==5) {n=0;printf("\n");

}

n++;}}

2 #include<stdio.h>

int fact(int a)

{int i,s=1;

for(i=1;i<=a;i++)

s=s*i;

return s;

}

void main()

{

int m,n,p;

scanf("%d,%d",&m,&n);

p=fact(m)/fact(m-n);

printf("p=%d\n",p);

}

3 #include<stdio.h>

float total(int a)

{int i;

float s=0;

for(i=1;i<=a;i++)

s=s+1.0/i;

return s;

}

void main()

{

int n;

float s; scanf("%d",&n); s=total(n); printf("s=%f\n",s);

} 4#include<stdio.h> int fn(int a,int n) {int i,s=0; for(i=1;i<=n;i++) {s=s+a;a=a*10;} return s;

}

void main()

{

int i,a,n,s=0; scanf("%d%d",&a,&n); for(i=1;i<=n;i++) s=s+fn(a,i); printf("s=%d\n",s);

}

5

#include "stdio.h"

#define INPUT(x,y) scanf("%d,%d",&x,&y)

#define FU(x,y) x%y

#define PR(a) printf("%d",a)

#define PRINT(a) PR(a);putchar('\n') void main()

{

int x,y;

INPUT(x,y); PRINT(FU(x,y));

}

6

#include "stdio.h"