This set of C Multiple Choice Questions & Answers (MCQs) focuses on “String Operations – 1”.
Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.
1. What will be the output of the following C code?
#include <stdio.h>#include <string.h>int main()
{char *str = "hello, world";
char *str1 = "hello, world";
if (strcmp(str, str1))
printf("equal");
elseprintf("unequal");
}
a) equal
b) unequal
c) Compilation error
d) Depends on the compiler
View Answer
Explanation: None.
2. What will be the output of the following C code?
#include <stdio.h>int main()
{char *str = "hello, world";
char str1[15] = "hello wo 9";
strcpy(str, str1);
printf("%s", str1);
}
a) Compilation error
b) Segmentation Fault
c) hello, world
d) hello, wo 9
View Answer
Explanation: None.
3. What will be the output of the following C code?
#include <stdio.h>#include <string.h>int main()
{char *str = "hello, world";
char str1[9];
strncpy(str1, str, 9);
printf("%s %d", str1, strlen(str1));
}
a) hello, world 11
b) hello, wor 9
c) Undefined behaviour
d) Compilation error
View Answer
Explanation: None.
4. What will be the output of the following C code?
#include <stdio.h>int main()
{char *str = "hello, world\n";
printf("%d", strlen(str));
}
a) Compilation error
b) Undefined behaviour
c) 13
d) 11
View Answer
Explanation: None.
5. What will be the output of the following C code?
#include <stdio.h>int main()
{char str[11] = "hello";
char *str1 = "world";
strcat(str, str1);
printf("%s %d", str, str[10]);
}
a) helloworld 0
b) helloworld anyvalue
c) worldhello 0
d) Segmentation fault/code crash
View Answer
Explanation: None.
6. Strcat() function adds null character.
a) Only if there is space
b) Always
c) Depends on the standard
d) Depends on the compiler
View Answer
Explanation: None.
7. What will be the output of the following C code?
#include <stdio.h>int main()
{char str[10] = "hello";
char *str1 = "world";
strncat(str, str1, 9);
printf("%s", str);
}
a) helloworld
b) Undefined behaviour
c) helloworl
d) hellowor
View Answer
Explanation: None.
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