Online C Programming Test - C Programming Test 5
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- Total number of questions: 20.
- Time allotted: 20 minutes.
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Marks : 2/20
Test Review : View answers and explanation for this test.
fmod(x,y) - Calculates x modulo y, the remainder of x/y.
This function is the same as the modulus operator. But fmod() performs floating point or long double divisions.
#include<stdio.h>
int main()
{
int i=-3, j=2, k=0, m;
m = ++i && ++j && ++k;
printf("%d, %d, %d, %d\n", i, j, k, m);
return 0;
}
Step 1: int i=-3, j=2, k=0, m; here variable i, j, k, m are declared as an integer type and variable i, j, k are initialized to -3, 2, 0 respectively.
Step 2: m = ++i && ++j && ++k;
becomes m = -2 && 3 && 1;
becomes m = TRUE && TRUE; Hence this statement becomes TRUE. So it returns '1'(one). Hence m=1.
Step 3: printf("%d, %d, %d, %d\n", i, j, k, m); In the previous step the value of i,j,k are increemented by '1'(one).
Hence the output is "-2, 3, 1, 1".
No, In a function two return statements can occur but not successively.
Example:
#include <stdio.h>
int mul(int, int); /* Function prototype */
int main()
{
int a = 0, b = 3, c;
c = mul(a, b);
printf("c = %d\n", c);
return 0;
}
/* Two return statements in the mul() function */
int mul(int a, int b)
{
if(a == 0 || b == 0)
{
return 0;
}
else
{
return (a * b);
}
}
Output:
c = 0
No, the header files have any kind of extension.
#include<stdio.h>
int main()
{
void *vp;
char ch=74, *cp="JACK";
int j=65;
vp=&ch;
printf("%c", *(char*)vp);
vp=&j;
printf("%c", *(int*)vp);
vp=cp;
printf("%s", (char*)vp+2);
return 0;
}
#include<stdio.h>
int main()
{
int x=30, *y, *z;
y=&x; /* Assume address of x is 500 and integer is 4 byte size */
z=y;
*y++=*z++;
x++;
printf("x=%d, y=%d, z=%d\n", x, y, z);
return 0;
}
#include<stdio.h>
int main()
{
int arr[3][3] = {1, 2, 3, 4};
printf("%d\n", *(*(*(arr))));
return 0;
}
#include<stdio.h>
#include<string.h>
int main()
{
char str[] = "India\0\BIX\0";
printf("%s\n", str);
return 0;
}
A string is a collection of characters terminated by '\0'.
Step 1: char str[] = "India\0\BIX\0"; The variable str is declared as an array of characters and initialized with value "India"
Step 2: printf("%s\n", str); It prints the value of the str.
The output of the program is "India".
#include<stdio.h>
int main()
{
struct emp
{
char *n;
int age;
};
struct emp e1 = {"Dravid", 23};
struct emp e2 = e1;
strupr(e2.n);
printf("%s\n", e1.n);
return 0;
}
#include<stdio.h>
#include<string.h>
void modify(struct emp*);
struct emp
{
char name[20];
int age;
};
int main()
{
struct emp e = {"Sanjay", 35};
modify(&e);
printf("%s %d", e.name, e.age);
return 0;
}
void modify(struct emp *p)
{
p ->age=p->age+2;
}
#include<stdio.h>
int main()
{
struct a
{
float category:5;
char scheme:4;
};
printf("size=%d", sizeof(struct a));
return 0;
}
Bit field type must be signed int or unsigned int.
The char type: char scheme:4; is also a valid statement.
The malloc() function shall allocate unused space for an object whose size in bytes is specified by size and whose value is unspecified.
The order and contiguity of storage allocated by successive calls to malloc() is unspecified. The pointer returned if the allocation succeeds shall be suitably aligned so that it may be assigned to a pointer to any type of object and then used to access such an object in the space allocated (until the space is explicitly freed or reallocated). Each such allocation shall yield a pointer to an object disjoint from any other object. The pointer returned points to the start (lowest byte address) of the allocated space. If the space cannot be allocated, a null pointer shall be returned. If the size of the space requested is 0, the behavior is implementation-defined: the value returned shall be either a null pointer or a unique pointer.
char far *far *scr;
char far far** scr;
Example:
fflush(FilePointer);
fflush(NULL); flushes all streams.