Question

Find the error in each of the following program segments and explain how to correct it

a) char s[10];

strncpy(s, "hello", 5);

printf("%s\n", s);

ANSWER:

b) printf("%s", 'a');

ANSWER:

c) char s[12];

strcpy(s, "Welcome Home");

ANSWER:

d) if (strcmp(string1, string2)) {

puts("The strings are equal");

}

ANSWER:

Answer 1

a.strncpy returns a pointer. We need to store it.

Correct statement could be: int *ptr= strncpy(s,"hello",5);

b. Here printf function is expecting a string parameter for format specifier %s. But 'a' is a character. So it generates segmentation error.

Correct statement could be : printf("%c",'a');

c. Length of "Welcome Home" is 13.

But size of character array s is 12.

There's no enough space to accommodate all the input string.

Correct statement could be:

chat s[13];

strcpy(s,"Welcome Home");

d.strcmp() might sometimes return negative values. if() won't take negative values. So we need to manage this scenario.

Correct code could be:

int cmp=strcmp(string1, string2);

if(cmp<0)

cmp*=-1;

if(cmp)

{puts("The strings are equal");}