bf.c

#include <stdio.h>

#define TAPE_SIZE 30000
#define SOURCE_SIZE 30000

char tape[TAPE_SIZE];

// cell is like tape[0] and if we say cell = cell + 1 then it's like  tape[1]
char *cell = tape;   

char source[SOURCE_SIZE] = "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.";
char *ip = source;                // instruction pointer

int loop;

int main()
{
    while(*ip)
    while(*ip)
    {
        switch(*ip)
        {
            case '>': ++cell; break;
            case '<': --cell; break;
            case '+': ++*cell; break;
            case '-': --*cell; break;
            case '.': putchar(*cell); break;
            case ',': *cell = getchar(); break;            
            case '[': 

                if(!*cell)     //*cell == 0        /* if cell at data pointer is zero */
                {
                    loop = 1;                /* loop variable holds a number of '[]' */
                    while(loop)         // loop != 0   /* do until find matching ']' */
                    {
                        ip++;  //sorry guys, *ip++ works but basically wrong, so removing '*' /* increment instruction pointer */

                        if(*ip == '[') loop++; // loop = loop + 1       /* inc loop on '[' instruction */
                        if(*ip == ']') loop--;        /* dec loop on ']' instruction */
                    }
                }

                break;

            case ']':
            
                loop = 1;                /* loop variable holds a number of '[]' */
                while(loop)       // loop != 0     /* do until find matching '[' */
                {
                    ip--; // same here                    /* decrement instruction pointer */
                   
                    if(*ip == '[') loop--;       /* dec loop on '[' instruction */
                    if(*ip == ']') loop++;       /* inc loop on ']' instruction */
                }

                ip--;       // and here                         /* decrement instruction pointer */
                break;
        }

        //printf("cell address: '%d'\n", cell);
        //putchar(*ip);
        ip++;        // ip = ip + 1;
    }

    //for(int i = 0; i < 10; i++) { printf("%d, ", tape[i]); }
    printf("\n");

    return 0;
}

Thank you, this helped me implement my own bf interpreter. I had really hard time implementing loops.