Atoi () function implementation

Implements the Atoi () function, which returns 0 on error;

1 intAtoiConst Char*str)2 {3     if((str = = NULL) | | (strlen (str) = =0)) {4         return 0;5     }6 7     intValue =0;8     intSign =0;9     intindex =0;Ten     intMinmark =0; One     Const intMAX =2147483647; A     Const intMIN =-2147483648; -      while(Str[index]! =' /') { -         Charc =Str[index]; the         if(c = ='+') || (c = ='-')) { -             if(Sign = =0) { -Sign = (c = ='+'?1: -1); -}Else { +                 return 0; -             } +}Else if(c >='0') && (c <='9')) { A             if(Value > MAX/Ten) { at                 return 0; -}Else if(Value = = MAX/Ten) { -                 ifC'0'> MAX%Ten+1) { -                     return 0; -}Else if(C-'0'= = MAX%Ten+1) && (sign = =-1) && (Minmark = =0)) { -Minmark =1; inValue = value *Ten+ MAX%Ten; -}Else ifC'0'<= MAX%Ten) { toValue = value *Ten+ C-'0'; +}Else { -                     return 0; the                 } *}Else{ $Value = value *Ten+ C-'0';Panax Notoginseng             } -}Else { the             return 0; +         } AIndex + +; the     } +     if(Minmark = =1) { -         returnMIN; $}Else if(Sign = =-1) { $Value *=-1; -     } -     returnvalue; the}

Atoi () function implementation