objective c - Xcode command line tool for calculator -

i want make command line calculator using xcode/osx application/command line tool/foundation type. in xcode, go products/scheme/edit scheme. in this, can add or delete command line arguments. these command line arguments stored in argument vector i.e. argv[].
i using nsarray store these arguments in objective-c array.
now, want make calculator can evaluate expression.
for example arguments argv[1]=5, argv[2]=+, argv[3]= 10, argv[4]=-, argv[5]=2. so, these arguments evaluate expression , give result. result=13.

#import <foundation/foundation.h>  int main(int argc, const char* argv[]) {      @autoreleasepool {         nsarray *myarray =[[nsprocessinfo processinfo] arguments];          (int i=1; i<argc ; i++) {             nslog (@"arguents %d=%@", i, myarray[i]);         }          return 0;     } } 

here's simple calculator, knocked-up in few minutes:

#import <foundation/foundation.h>  typedef enum {     op_none,     op_add,     op_sub,     op_mult,     op_div } op;  static int calc(nsarray *args) {     op op = op_none;     int result = 0;     (nsstring *arg in args) {         if ([arg isequaltostring:@"+"]) {             op = op_add;         } else if ([arg isequaltostring:@"-"]) {             op = op_sub;         } else if ([arg isequaltostring:@"*"]) {             op = op_mult;         } else if ([arg isequaltostring:@"/"]) {             op = op_div;         } else {             int value = [arg intvalue];              // no error checking!!!             switch(op) {                 case op_add: result += value; break;                 case op_sub: result -= value; break;                 case op_mult: result *= value; break;                 case op_div: result /= value; break;                 case op_none: result = value; break;                 default: abort();             }             op = op_none;         }     }     return result; }  int main(int argc, const char **argv) {     @autoreleasepool {         nsmutablearray *args = [nsmutablearray new];         (int = 1; < argc; i++)             [args addobject:@(argv[i])];         nslog(@"result = %d", calc(args));     }     return 0; } 

compile with:

$ clang -ddebug=1 -g -fobjc-arc -o calc calc.m -framework foundation 

tests:

typhon:tinkering (master) $ ./calc 3 + 9 2014-04-26 13:23:05.628 calc[8728:507] result = 12 typhon:tinkering (master) $ ./calc 2 / 1 2014-04-26 13:23:20.500 calc[8738:507] result = 2 typhon:tinkering (master) $ ./calc 99 / 11 2014-04-26 13:23:25.364 calc[8742:507] result = 9 typhon:tinkering (master) $ ./calc 99 / 12 2014-04-26 13:23:27.740 calc[8746:507] result = 8 typhon:tinkering (master) $ ./calc 99 \* 11 2014-04-26 13:23:53.588 calc[8754:507] result = 1089 

notes:

• it's integer maths @ moment, easy convert floating point.
• there no error checking when parsing number.
• if want multiplication need specify \* * symbol shell globbing.
• you don't need nsprocessinfo command line arguments passed main().