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

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;
   
}

[tags]atoi,string to integer,atoi source code,atoi code,atoi program,string to integer program[/tags]

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Related Blog Items

• Convert integer to binary string
• i64toa - Converts a 64 bit integer to string
• C/C++ Interview algorithms
• Unsigned long to string (ultostr)
• const correctness

This entry was written by ponnada and posted on December 22, 2006 at 12:54 pm and filed under C Tidbits, Conversions. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.