TCS Company Programming Output

In the standard library of C programming language, which of the following
header file is designed for basic mathematical operations?
1. conio.h
2. stdio.h
3. math.h
4. Dos.h

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TCS Other Question

What function should be used to free the memory allocated by calloc() ?
1. free();
2. malloc(variable_name, 0)
3. dealloc();
4. memalloc(variable_name, 0)
int **ptr; is?
1. Pointer to integer
2. None of these
3. Pointer to pointer
4. Invalid declaration