Thread: compare pointer and integer?

Originally Posted by Elysia

Divide the terms into tokens.
50 pointers to char -> 50 pointers, char. That is: char* example[50]
Array of 50 arrays of char -> Array, 50 arrays, char. That is: char Example[N][50]
Where N is a positive number.

you mean to change char* cmd_words[50] to char cmd_words[50][50]?
ms. laserlight told me not to use global variables so if i combine your suggestions it will look like this:

Code:

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

void make_mat(void);
char get_cmd(void);


int main(void)
{
	char cmd_words[50][50];
    while (1)
    {
        get_cmd();
        if (strcmp(cmd_words[0], "MAKE") == 0)
            make_mat();
        else if (strcmp(cmd_words[0], "DISP") == 0)
            printf("DISP");
        else
            printf("Invalid Command!");
    }
}

/*Get Command Function*/
char get_cmd(void)
{
    char cmd_str[50] = "\0";
	 char cmd_words[50][50];
    int loop;

    printf("\n>>");
    gets(cmd_str);

    cmd_words[0] = strtok(cmd_str, " ");
    if (cmd_words[0] == NULL)
    {
        printf("Error.\n");
    }

    for (loop = 1; loop < 50; loop++)
        cmd_words[loop] = strtok(NULL, " ");

    return *cmd_words[0];
}

/*Make Function*/
void make_mat(void)
{
   int i, j;
   char cmd_words[50][50];

    if (strcmp(cmd_words[1], "A") == 0)
    {
        int mat_A[50][50];
        int r1, c1;

        printf("Enter rows: ");
        scanf("%d", &r1);
        printf("Enter columns: ");
        scanf("%d", &c1);
        for (i = 0; i < r1; i++)
            for (j = 0; j < c1; j++)
            {
                printf("A[%d][%d] = ", i, j);
                scanf("%d", &mat_A[i][j]);
            }
    }
    else if (strcmp(cmd_words[1], "B") == 0)
    {
        int mat_B[50][50];
        int r2, c2;

        printf("Enter rows: ");
        scanf("%d", &r2);
        printf("Enter columns: ");
        scanf("%d", &c2);
        for (i = 0; i < r2; i++)
            for (j = 0; j < c2; j++)
            {
                printf("A[%d][%d] = ", i, j);
                scanf("%d", &mat_B[i][j]);
            }
    }
    else if (strcmp(cmd_words[1], "C") == 0)
    {
        int mat_C[50][50];
        int r3, c3;

        printf("Enter rows: ");
        scanf("%d", &r3);
        printf("Enter columns: ");
        scanf("%d", &c3);
        for (i = 0; i < r3; i++)
            for (j = 0; j < c3; j++)
            {
                printf("A[%d][%d] = ", i, j);
                scanf("%d", &mat_C[i][j]);
            }
    }
}

but my compiler said that in function, char get_cmd(), lines 33 & 40 have incompatible types in assignment of `char *' to `char[50]'. what does that mean?

i just wanted to know how to seperate strings into the different words, variables or numbers (which serves as the commands) it has, as long as it is seperated by a space, because later on i will have to deal with strings with 4 commands such as:

Code:

>>MMUL A B C

which means that matrix A will be multiplied to matrix B and the answer will be stored to matrix C or

Code:

>>SMUL 2 A B

which means that a scalar(int), 2, will be multiplied to matrix A and the answer will be stored to matrix B or

Code:

>>ADDR A 1 2 3

How about using "main(int argc, int * argv[])" to take in command line arguments?