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main()
{
int n;
printf("input number\n");
scanf("%d",&n);
s(n);
printf("n=%d\n",n);
}
int s(int n)
{
int i;
for(i=n-1;i>=1;i--)
n=n+i;
printf("n=%d\n",n);
}
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#include"stdlib.h"
void ContrTwo(char i)
{
char str1[8];
itoa(i,str1,2);
printf("%s",str1);
}
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