Which of the following function sets first n characters of a string to a given c

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Which of the following function sets first n characters of a string to a given character?

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2) How will you print \n on the screen?

3) What will be the output of the program ?

 #include<stdio.h>
#include<string.h>
int main()
{
char str[] = "Study 2 Online\0 C Language MCQ\0";
printf("%s\n", str);
return 0;
}

4) If the two strings are identical, then strcmp() function returns

5) What is the output of this C code?

#include <stdio.h>
int main()
{
char str[11] = "hello";
char *str1 = "world";
strcat(str, str1);
printf("%s %d", str, str[10]);
}

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