Question

In C++

Given the declaration 
char str1[15];
char str2[15] = "Good day"; 
mark the following statements as valid or invalid. If invalid, explain why. NOTE: Assume that the directive #define _CRT_SECURE_NO_WARNINGS has been entered appropriately in the program.

a) if(strlen(str1)>=strlen(str2)) str1 = str2;

b) if(strcmp(str1,str2))
 cout << "The strings are equal";

Answer 1

a) if(strlen(str1)>=strlen(str2)) str1 = str2; #invalid

It is invalid because both are fixed arrays and cant be directly copied to the other.
Here the main reason is the the pointers str1 and str2 are fixed pointers and cant be changed.
If we take another pointer then we can assign the array to the pointer as pointer is variable pointer.

b) if(strcmp(str1,str2))cout << "The strings are equal";#valid
This is valid statement that just compares the two strings as the strings are not equal the value returned here is negative value thus prints the output.

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Thank you.