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Here is my code:

How to change it?

#include <stdio.h>

void cycle(int a);
int cl;

int main(void)
{
unsigned int i, j, max;
int k, Up, Lower;
extern int cl;

while (scanf("%d %d", &i, &j))
{
max = 0;
Up = i > j ? i : j;
Lower = i < j ? i : j;

for ( k = Lower; k <= Up; k++ )
{
cl = 0 ...