Complete C Programming Notes – Basics to Advanced Concepts with Examples

All keywords in C are in ____________
a) LowerCase letters
b) UpperCase letters
c) CamelCase letters
d) None of the mentioned
ANSWER: A
Which of the following declaration is not supported by C language?
a) String str;
b) char *str;
c) float str = 3e2;
d) Both “String str;” and “float str = 3e2;”
ANSWER: A
What is meant by ‘a’ in the following C operation?
fp = fopen("Random.txt", "a");
a) Attach
b) Append
c) Apprehend
d) Add
ANSWER: B
What will be the output of the following C code?

#include <stdio.h>
int main()
{
int y = 10000;
int y = 34;
printf("Hello World! %d\n", y);
return 0;
}
a) Compile time error
b) Hello World! 34
c) Hello World! 1000
d) Hello World! followed by a junk value
ANSWER: A
What will happen if the following C code is executed?

#include <stdio.h>
int main()
{
int main = 3;
printf("%d", main);
return 0;
}