C Programming Questions and Answers – External Variables
C Programming Questions and Answers – External Variables
1.What is the output of this C code?
#include <stdio.h>
void main()
{
m();
printf(“%d”, x);
}
int x;
void m()
{
x = 4;
}
a) 4
b) Compile time error
c) 0
d) Undefined
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2.What is the output of this C code?
#include <stdio.h>
int x;
void main()
{
printf(“%d”, x);
}
a) Junk value
b) Run time error
c) 0
d) Undefined
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3.What is the output of this C code?
#include <stdio.h>
int x = 5;
void main()
{
int x = 3;
printf(“%d”, x);
{
x = 4;
}
printf(“%d”, x);
}
a) Run time error
b) 3 3
c) 3 5
d) 3 4
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4.What is the output of this C code?
#include <stdio.h>
int x = 5;
void main()
{
int x = 3;
printf(“%d”, x);
{
int x = 4;
}
printf(“%d”, x);
}
a) 3 3
b) 3 4
c) 3 5
d) Run time error
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5.Functions in C are ALWAYS:
a) Internal
b) External
c) Both Internal and External
d) External and Internal are not valid terms for functions
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6.Global variables are:
a) Internal
b) External
c) Both (a) and (b)
d) None of the mentioned
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7.Which of the following are an external variable?
#include <stdio.h>
int func (int a)
{
int b;
return b;
}
int main()
{
int c;
func (c);
}
int d;
a) a
b) b
c) c
d) d
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8.What will be the output?
#include <stdio.h>
int main()
{
printf(“%d”, d++);
}
int d = 10;
a) 9
b) 10
c) 11
d) Compile time error
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9.What will be the output?
#include <stdio.h>
double var = 8;
int main()
{
int var = 5;
printf(“%d”, var);
}
a) 5
b) 8
c) Compile time error due to wrong format identifier for double
d) Compile time error due to redeclaration of variable with same name
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10.What is the output of this C code?
#include <stdio.h>
double i;
int main()
{
printf(“%g\n”,i);
return 0;
}
a) 0
b) 0.000000
c) Garbage value
d) Depends on the compiler
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11.Which part of the program address space is p stored in the code given below?
#include <stdio.h>
int *p = NULL;
int main()
{
int i = 0;
p = &i;
return 0;
}
a) Code/text segment
b) Data segment
c) Bss segment
d) Stack
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12.Which part of the program address space is p stored in the code given below?
#include <stdio.h>
int *p;
int main()
{
int i = 0;
p = &i;
return 0;
}
a) Code/text segment
b) Data segment
c) Bss segment
d) Stack
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13.Can variable i be accessed by functions in another source file?
#include <stdio.h>
int i;
int main()
{
printf(“%d\n”, i);
}
a) 0
b) false
c) Only if static keyword is used
d) Depends on the type of the variable
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14.Property of external variable to be accessed by any source file is called by C90 standard as
a) external linkage
b) external scope
c) global scope
d) global linkage
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15.What is the output of this C code?
#include <stdio.h>
int *i;
int main()
{
if (i == NULL)
printf(“true\n”);
return 0;
}
a) true
b) true only if NULL value is 0
c) Compile time error
d) Nothing
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16.What is the output of this C code?
#include <stdio.h>
int *i;
int main()
{
if (i == 0)
printf(“true\n”);
return 0;
}
a) true
b) true only if NULL value is 0
c) Compile time error
d) Nothing
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17.What is the output of this C code?
#include <stdio.h>
static int x = 5;
void main()
{
x = 9;
{
int x = 4;
}
printf(“%d”, x);
}
a) 9
b) 4
c) 5
d) 0
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