Simple parenthesis parser.

parse.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

void parse(char* in);
void main(){

    char* in="12+(13-22)+(2-4/(33-456))";
    parse(in);
}

void parse(char* in){
    int level=0;
    int begin=0;
    int end=0;
    puts(in);
    for(int i=0;i<strlen(in);i++){
        //printf("%d %c\n", i, in[i]);
        if (in[i] == '('){
            if(level == 0){
                begin=i;
            }
            level++;
            continue;
        } else if (in[i] == ')'){
            if(level == 1){
                char* n = strndup(in+begin+1, i-begin-1);
                parse(n);
            }
            level--;
            continue;
        }
    }
    if(begin == 0) {
        // run expression and return some stuff.
    }
}