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Loops in C programming.
main()
{
int c[ ]={2.8,3.4,4,6.7,5};
int j,*p=c,*q=c;
for(j=0;j -
Recursion C program.
main() { static int var = 5; printf("%d ",var--); if(var) main(); }
Ans:5 4 3 2 1 Explanation:When static storage class is given, it is initialized once. The change in the value of a static variable is retained even between the function calls. Main is also treated like any other ordinary function, which can be called recursively. -
Different ways of expressing the same idea.
main(){ char s[ ]="man"; int i; for(i=0;s[ i ];i++) printf("n%c%c%c%c",s[ i ],*(s+i),*(i+s),i[s]);}
Ans:mmmm
aaaa
nnnn
Explanation:s[i], *(i+s), *(s+i), i[s] are all different ways of expressing the same idea. Generally array name is the base address for that array. Here s is the base address. i is the index number/displacement from the base address. So, indirecting... -
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case 1: printf("one");
break;
case 2:printf("two");
break;
case 3: printf("three");
break;
}
}
">Ix) main(){ int i=3; switch(i) { default:printf("zero"); case 1: printf("one"); break; case 2:printf("two"); break; case 3: printf("three"); break; } }
threeExplanation :The default case can be placed anywhere inside the loop. It is executed only when all other cases doesn't match.
Lakshmi Prabha
- Oct 22nd, 2005
The output will be three because when execution takes place ,inside the switch the corresponding case 3(since i=3)is selected and as there is a break statement after it, it cmes out of the loop.
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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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Is it acceptable to declare/define a variable in a C header?
A global variable that must be accessed from more than one file can and should be declared in a header file. In addition, such a variable must be defined in one source file. Variables should not be defined in header files, because the header file can be included in multiple source files, which would cause multiple definitions of the variable. The ANSI C standard will allow multiple external definitions,...
nsivaramprasad
- Nov 28th, 2005
A variable can be declare/define in a C Header without any kind of compilational/ logical errors. But it is against the coding specifications and it is not normally practiced. If proper Multiple inclu...
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">Main(){ int i = 100; clrscr(); printf("%d", sizeof(sizeof(i)));}
A) none of the aboveB) 4C) 100D) 2
gau_bhatnagar
- Dec 29th, 2005
Internal sizeof(i) gives output 2.2 is integer so outer sizeof()again gives output 2.
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What would be the output of the following program? main() { int y=128; const int x=y; printf("%d",x); }
A) 128B) Garbage valueC) ErrorD) 0
Amit
- Dec 12th, 2005
Correct ans is A) 128
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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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# define prod(a,b)=a*bmain(){int x=2;int y=3;printf("%d",prod(x+2,y-10));}the output of the program isA. 8B. 6C. 7D. None
Rohan
- Feb 23rd, 2006
Ans is ( D ) Macro just Substitutes its arguments so ,prod ( x + 2 , y - 10 ) will be substituted by 2+2*3-10 so ans is 2+6-10=-2 None of the list given has ans is -2has ans is ( D )
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What is use of macro arguments in c? what is major difference between normal macro definition and macro arguments.
kapil mandge
- Feb 25th, 2006
Macro is not inline function: we can see here...#SQR(x) x*xvoid inline SQR(int x){x*=x;}if we call macroSQR(++y) than it will work like this ++y*++y, value of y increamenting twice.but when we call inline function value is increamented only once i think that is right.
mef526
- Feb 13th, 2006
In above answer the macro SQR(4-y) doesn't work as expected. Can you see why?A macro is not an inline function, it is a text replacement done by the C preprocessor. Think of it as a search and replace with replaceable parameters.
C Interview Questions
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