#include<stdio.h>

int strToInt(const char string[]);

int main(void)

{

printf ("%i\n", strToInt("245"));

printf ("%i\n", strToInt("100") + 25);

printf ("%i\n", strToInt("13x5"));

return 0;

}

int strToInt (const char string[])

{

int i, intValue, result = 0;

for ( i = 0; string[i] >= '0' && string[i] <= '9'; ++i )

{

intValue = string[i] - '0';

printf("intvalue = %i\n",intValue);

result = result * 10 + intValue;

printf("result = %i\n",result);

}

return result;

}