◄Up► ◄Contents► ◄Index► ◄Back► ─────Run-Time Library─────────────────────────────────────────────────────── /* ASSERT.C illustrates: * assert */ #include <stdio.h> #include <conio.h> #include <string.h> #include <assert.h> #define MAXSTR 120 void chkstr( char *string ); /* Prototype */ void main() { char string1[MAXSTR], string2[MAXSTR]; /* Do various processes on strings and check the results. If * none cause errors, force an error with an empty string. */ printf( "Enter a string: " ); gets( string1 ); chkstr( string1 ); printf( "Enter another string: " ); gets( string2 ); chkstr( string2 ); strcat( string1, string2 ); chkstr( string1 ); printf( "string1 + string2 = %s\n", string1 ); chkstr( "" ); printf( "You'll never get here\n" ); } /* Tests a string to see if it is NULL, empty, or longer than MAXSTR. */ void chkstr( char *string ) { assert( string != NULL ); /* Cannot be NULL */ assert( *string != '\0' ); /* Cannot be empty */ assert( strlen( string ) < MAXSTR ); /* Length less than maximum */ } -♦-