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In the following code; #include<stdio.h> main() { FILE *fp; fp= fopen("trial","r"); } fp points to: a) The first character in the file. b) A structure which contains a "char" pointer which points to the first character in the file. c) The name of the file. d) None of the above.
shrutimitra
- Oct 23rd, 2005
B) A structure which contains a "char" pointer which points to the first character in the file.
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If the following program (myprog) is run from the command line as myprog monday tuesday wednesday thursday, What would be the output? main(int argc, char *argv[]) { while(--argc >0) printf("%s",*++argv); } a) myprog monday tuesday wednesday thursday b) monday tuesday wednesday thursday c) myprog tuesday thursday d) None of the above
shrutimitra
- Oct 23rd, 2005
B) monday tuesday wednesday thursday. Because in while loop we have (--argc) which will ensure that the loop will run for 4 times. if we want to print value of (*++argv) ,it will skip the first value of argv array.
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Point out the error in the following program main() { const int x; x=128; printf("%d",x); }
x should have been initialized where it is declared.
shrutimitra
- Oct 23rd, 2005
We can not assign a value to a const variables. we can only initialize it while creating or declearing the variable.
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Point out the error in the following program main() { int a=10; void f(); a=f(); printf("n%d",a); } void f() { printf("nHi"); }
The program is trying to collect the value of a "void" function into an integer variable.
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else
printf("I hate U");
}
">Iii) main(){ float me = 1.1; double you = 1.1; if(me==you)printf("I love U");else printf("I hate U");}
I hate UExplanation:For floating point numbers (float, double, long double) the values cannot be predicted exactly. Depending on the number of bytes, the precession with of the value represented varies. Float takes 4 bytes and long double takes 10 bytes. So float stores 0.9 with less precision than long double.Rule of Thumb: Never compare or at-least be cautious when using floating point numbers with...
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}
">X) main(){ printf("%x",-1
fff0Explanation :-1 is internally represented as all 1's. When left shifted four times the least significant 4 bits are filled with 0's.The %x format specifier specifies that the integer value be printed as a hexadecimal value
xeejam
- Nov 11th, 2005
Depending on the machine implementation it will result in FFFFFF0 (for 32bit ) or FFF0 (16 bit )
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}
}
">Main(){ int i; clrscr(); for(i=0;i
A) 1, 2, 4, 8, 16B) 0, 1, 2, 4, 8C) 0, 1, 2, 3, 4D) 5, 4, 3, 2, 1Explanation: L does't make any diff.
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> (i - (i -1)));
}
}
">Main(){ signed int bit=512, i=5; for(;i;i--) { printf("%dn", bit >> (i - (i -1))); }}
A) 512, 512, 512, 512, 512B) 256, 256, 0, 0, 0C) 512, 256, 0, 0, 0D) 256, 256, 256, 256, 256Explanation: bit's value is not changed
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How argc and argv works in the following main function?main(int argc,char *argv[]) { int n,i=0; while(argv[1][i]!=\'\\0\') { n=fun(); i++;} printf(\
mpanigrahi
- Mar 22nd, 2006
*****main can recieve its own arguments but in a preconditioned way: main (int argc, char **argv) { ............ }*****% a.out 1 my_input argc is 3 argv[0] = "a.out" argv[1]="1" argv[2]="my_input"
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What is Static function in C?and what is the use of it
vipin gupta
- Oct 20th, 2006
The question is already posted on the list..... A lot of answers are also available.... u should see the previous answers before posting a new problem.....
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How to write a program which prints its own source code as output?
_jawahir_
- Jun 17th, 2011
//***************jawahir007***************//#include<stdio.h>#include<conio.h>void main(int argc, char *argv[]){ char ch,*f,i; FILE *fp; clrscr(); for(i=0;argv[0][i]!='...
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C Code to print number in reverse
Write a program to print the given number in reverse order for e.g 123 as 321
Padma Sirisha
- Jul 13th, 2011
Here is the code
Code- #include<stdio.h>
- "enter the u want number");
- scanf("%d""the reverse number is;%d",reverseno);
- }
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Global variables in c program
If i initialize a global array locally in main function i can still access those elements in other functions as if the elements of array were global whereas this is not the case if i do the same with other basic variables like int i.can someone explain?
anjali_taneja
- Jul 6th, 2011
Global variables are stored in Heap.They have global access anywhere in the program.But local variable get priority over global variable.
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Calculate the weighted average of a list of n numbers
Calculate the weighted average of a list of n numbers using the formula
xavg = f1x1+f2x2+ ….+ fnxn
where the f’s are fractional weighting factors, i.e.,
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When should the volatile modifier be used?
The volatile modifier is a directive to the compiler’s optimizer that operations involving this variable should not be optimized in certain ways. There are two special cases in which use of the volatile modifier is desirable. The first case involves memory-mapped hardware (a device such as a graphics adaptor that appears to the computer’s hardware as if it were part of the computer’s memory), and...
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How can you restore a redirected standard stream?
The preceding example showed how you can redirect a standard stream from within your program. But what if later in your program you wanted to restore the standard stream to its original state? By using the standard C library functions named dup() and fdopen(), you can restore a standard stream such as stdout to its original state. The dup() function duplicates a file handle. You can use the dup()...
C Interview Questions
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