how to compare words on C

Question

i tried to make a code for a friend in C but i have no idea why it's not working, could someone please help me? (i want a simple version-fix if it's possible, because i've only started to study c a couple of weeks ago)

 #include <stdio.h>

    #include<string.h>





int main ()



{



     char *name="alina";

    char *input;

    printf ("what's your name? \n");

    scanf ("%s",&input);

    if (input=="alina")

    printf("your name is %s good job!\n ",&name);

    if (input!="alina")

 printf("are you sure? open the program again and insert the correct name");

    while (1);

Answer 1

You did some errors. First, if you want to insert a string, you can use the %s, but you have to use an array of char in which you can store that string. That's, you have to write something like this.

char input[100];
scanf("%s", input);

and then it'll work. This snippet of code means: I need to insert (store) a string. So first I create a place in which I can store it (pay attention that the string must be maximum of 99 characters; my array has size 100, but the last character is used to represent the end of the string), and then I use the scanf to write what I want.

The second error is that if you want to compare two strings, you can't simply use the == or !=, like when you do with numbers. The string.h library lets you use the strcmp function, like this:

if (strcmp(name, input) == 0)   // this means the strings are equal
   ...
else
   ...

remembering that

char* name = "Alina";
char input[100];

Eventually, here you're an inspected version of your code:

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

int main() {

    char* name = "Alina";
    char input[100];
    printf("What's your name?\n");
    scanf("%s", input);
    if (strcmp(name, input) == 0)
        printf("Your name is %s good job!\n", name);
    else
        printf("Are you sure? Open the program again and insert the correct name\n");

    return 0;
}

The while(1) at the end of your code is absolutely dangerous, because it starts an infinite loop that never ends, crashing your program. You want to definitely remove it!

how to compare words on C

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