help with strings

**RavUnRex** · 12-05-2005

Hey all. I'm writing a program involving strings. I can get the user to input the information, however, I am getting stuck when trying to test the user's information.

I want to know why I can't perform the bolded code? I want to test if the color the user input is equal to the color I type in "quotes".

Code:

	char color1[STRING],
		color2[STRING],
		color3[STRING];
	char holder;
	int a, b, c;
       
	printf("Enter the colors of the resistor's three bands, beginning with\nthe band nearest the end.  Type the colors in lowercase letters\nonly, NO CAPS.\nBand 1 => ");
	scanf("%s", color1);
	printf("\nBand 2 => ");
	scanf("%s", color2);
	printf("\nBand 3=> ");
	scanf("%s", color3);

	if (color1 = "black")
		a = 1;
	if (color1 = "brown")
		a = 2;

	printf("\n%f", &a);

	
	return (0);
}

**quzah** · 12-05-2005

1 - You're using = which is the assignment operator, not == which is used for equality testing.
2 - You can't compare strings in C using ==, you have to use some of the string functions (or write your own), such as strcmp.
3 - %f is for floating point numbers, not integers.
4 - &variable is the address of a variable, which is not what you're trying to print.

Quzah.

**dwks** · 12-05-2005

Code:

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

int main(void) {
    char s[100], *p;

    printf("\nEnter your password: ");
    fgets(s, sizeof(s), stdin);

    if((p=&s[strlen(s)-1]) == '\n') *(p-1) = 0;

    if(strcmp(p, "thepassword") == 0) {
        printf("\nPass");
    }
    else {
        printf("\nWrong password");
    }

    return 0;
}

**itsme86** · 12-05-2005

Code:

if((p=&s[strlen(s)-1]) == '\n') *(p-1) = 0;

Don't you mean *p = 0;?

**dwks** · 12-05-2005

Yes, I just realized I'd already subtracted 1.

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