2a.c


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

int main(void)
{
    char buff[80];
    int depth = 0;
    int aim = 0;
    int horiz = 0;

    while(fgets(buff, sizeof buff, stdin))
    {
        char *tok[2] = {0};

        tok[0] = strtok(buff," ");

        if (tok[0]) tok[1] = strtok(NULL, " ");

        if (tok[0] && tok[1])
        {
            int i = atoi(tok[1]);

            if(strcmp(tok[0], "forward") == 0)
            {
                horiz += i;

                depth += i * aim;
            }

            if(strcmp(tok[0], "down") == 0)
            {
                aim += i;
            }

            if(strcmp(tok[0], "up") == 0)
            {
                aim -= i;
            }
        }
        else
        {
            printf("Bad input");
            exit(1);
        }
    }

    printf("depth=%d\n", depth);
    printf("horiz=%d\n", horiz);
    printf("product=%d\n", depth*horiz);

    return 0;
}