Thread: Help w/ comparings two strings case sensitive

This is what i have for comparing two strings case sensitive. And i added a printf statement to test the numerical values of teh strings and the values are supposed to be the same but they are not. The plan was to use the numerical values to test, but i get different outputs.

Code:

#include <stdio.h>
#include <conio.h>
main()
{
	int loop=0, strone, strtwo; 
	char str[80]={"cprog"};
	char str2[80]={"cprog"};
	

strone=str;
strtwo=str2;


printf("%d", strone);
printf("\n%d", strtwo);
			
/*this tests whether the two are same or not*/
	/*	if(strone==strtwo)
		{
			printf("The strings are equal");
		}		
		else
		printf("The strings are not equal");
	
	*/	getch();
	

}

/*OUTPUT

1244964
1244884

  */

-ikkin

strcmpi(str1, str2) returns 1 if 2 strings are the same, excluding case, otherwise it returns 0 if they are different.

EDIT: Don't forget to include string.h!!

strcmp(str1, str2) is case sensitive - sorry, misread post .
strcmpi(str1, str2) works the same way, but isnt case sensitive .

Thats okay

But the problem is that i have to write my own function that compares the two strings

Thanx.

Code:

#include <stdio.h>
#include <stdlib.h>
void my_strcmp(char *string1,char *string2); /*compares string one to string 2*/
int main(){
        char strone[BUFSIZ];
        char strtwo[BUFSIZ];
        printf("Enter a string!\n");
        fgets(strone,sizeof(strone),stdin);
        printf("Enter another string!\n");
        fgets(strtwo,sizeof(strtwo),stdin);
        printf("%s%s",strone,strtwo);
        my_strcmp(strone,strtwo);
        return 0;
}
void my_strcmp(char *string1,char *string2){
        int str1=0,str2=0,diff,;
        while(string1[str1]!='\0'){
                str1++;
        }
        while(string2[str2]!='\0'){
                str2++;
        }
        diff=str1-str2;
        printf("diff = %i\n",diff);
        printf("str1 = %i\nstr2 = %i\n",str1,str2);
}

This is a start I don't feel like doing the whole case sensitive side of this program if anyone wants to build off of this I wouldn't mind

Since this is homework, you should figure this out on your own, right?

The basic idea is that uppercase letters and and their lowercase equivalent are always a certain distance apart on an ASCII chart.

Here's the code for a simple comparison function you can easily modify into strcmp() (and eventually, strcasecmp()):

Code:

int
 streq(const char s1[], const char s2[])
{
 int index;

    for(index = 0; (s1[index] != 0) && (s2[index] != 0); ++index)
   {
        if(s1[index] != s2[index])  return 0;
   } 
  
 // make sure we've reached the end of both strings:

    if((s1[index] != 0) || (s2[index] != 0))  return 0; 

 return 1;
}