View Code of Problem 101

#include<stdio.h> 
#include<string.h> 
int main() 
{ 
char c[100],b[100];
int i,j=0,k=0;
while(gets(c)!=NULL)
{

for(i=strlen(c)-1;i>=0;i--)
{
if(c[i]!=',')
{
if(k==3)
{
b[j++]=',';
k=0;
}
b[j++]=c[i];
k++;
}

}
j--;
for(i=0;j>=0;j--,i++)
c[i]=b[j];
printf("%s\n",c);
j=0;k=0;
for(i=0;i<100;i++)
b[i]=c[i]=NULL;
}
return 0;
}

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