bracket_checker

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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
struct element {
    char sym;
    struct element *p;
};

char set[]="{(())}[{(({(())}[][][]()()))}[][][]()({(({(())}[][][]()()))}[][][]()())][][]()()";

int main(int argc, char *argv[]) {
    struct element *top=NULL,*memory;
    int i=0,j;
    while(set[i]) {
        memory=(struct element*)malloc(sizeof(struct element));
        memory->p=top;
        memory->sym=set[i];
        top=memory;
        if (((top->sym==')')&&((top->p)->sym=='('))||((top->sym==']')&&((top->p)->sym=='['))||((top->sym=='}')&&((top->p)->sym=='{'))) {
            for (j=0;j<2;j++) {
                memory=top->p;
                free(top);
                top=memory;
            }
        }
        i++;
    }
    if (top) printf("Error\n");
    else printf("OK");
    return 0;
}