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What is the problem in that code ? plz help me

#include<stdio.h>
#include<string.h>
int main()
{
long sec,speed,i,j,temp;
long double distance;
sec=0,speed=0;
distance=0;
char str[100];
while(gets(str))
{
int len = strlen(str);
if(len>8)
{
temp = ((((str[0]-'0')*10)+(str[1]-'0'))*60*60 ...