[SOLVED] Problems with using string compare functions of string.h

[sherazi]

i am getting errors for using string compare functions of string.h

char m1[9]="00000000\0";
unsigned char numb[9]="00000000\0";
if (strncmp(m1,numb1,8)==0)

i get this error

Error	8	expected 'const char *' but argument is of type 'unsigned char *'

how can i solve this, I am using avrstudio5 and my target is Atmega644

 

[bigdogguru]

Re: problems with stncmp

The compiler error indicates it expects a "const char *" and doesn't seem to like the "unsigned" type specifier.

Have you tried removing the type specifier "unsigned" :

original

unsigned char numb[9]="00000000\0";

rewritten

char numb[9]="00000000\0";

Also in the call to the strncmp(), you have:

if (strncmp(m1,numb1,8)==0)

shouldn't numb1 be numb

if (strncmp(m1,numb,8)==0)

The compiler didn't seem to complain about m1, so try removing the "unsigned"

And if all else fails, you can always cast

if (strncmp(m1,(const char *)numb,8)==0)

Try these suggestions and let me know the results.

 

[sherazi]

Re: problems with stncmp

thanks .
replacing

unsigned char numb1[9]

with

char numb1[9]

solved the issue.

regarding numb and numb1 issue ,that was a typing error its numb1 everywhere