C Programming - String to Integer (atoi)

Another TechMahindra Interview question. The question was to convert a VALID string into its corresponding integer value.

Post in your comments!

Solution:


int atoi(char *string)
{
    int value=0,sign=1;
    
   if ( !string || !*string ) return 0;
   
   if ( *string == '-' ) {
        sign = -1;
        string++;
   }
   
   while ( *string ) {
         if ( (*string >= '0') && (*string <= '9') ) {
              value = value * 10 + (*string - '0');
         }
         else
             break;
         string++;
   }
   return sign * value;
    
}

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