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How to swap two variables, without using third variable ?
Answers were Sorted based on User's Feedback
Answer / yogendra
a=5
a=5,b=10
a=a+b
a=10+5=15
a=15
b=a-b
b=15-10
b=5
a=a-b
a=15-5
a=10 and b=5
a=10 and b=5
| Is This Answer Correct ? | 0 Yes | 2 No |
Answer / praveen kumar kesani
x=10,y=20;
x=x*y;
y=x/y;
x=x/y;
after swapping : x=20,y=10
| Is This Answer Correct ? | 2 Yes | 5 No |
Answer / ruchi
let the two numbers are a & b
a=a+b
b=a-b
a=a-b
let a=5 & b=10
a=a+b=15
b=a-b=15-10=5
b=5
a=a-b=15-5=10
hence a & b become 10 & 5
| Is This Answer Correct ? | 0 Yes | 3 No |
Answer / balusamy
Try this answer for reverse a string
#include<stdio.h>
void main()
{
char array[50] = "thgir si rewsna ym";
int len,i,j,temp;
len = strlen(array);
for(i = 0, j = len - 1; i < j; i++, j--)
{
temp = array[i];
array[i] = array[j];
array[j] = temp;
}
printf("%s\n",array);
}
| Is This Answer Correct ? | 0 Yes | 4 No |
Answer / smita
suppose a=5 and b=10
a=a*b ==>a=50
b=a/b ==>b=5;
a=a/b ==>a=10;
| Is This Answer Correct ? | 1 Yes | 5 No |
Answer / ashok
The first two answers are correct. Third will FAIL in the
case the second num is 0...Please do not post wrong answer
| Is This Answer Correct ? | 3 Yes | 8 No |
Answer / some guy
declare a fourth variable and use that.
I dont understand why you need to do any of the above ??? if fourth is a problem, declare fifth and so on...
| Is This Answer Correct ? | 2 Yes | 7 No |
Answer / robince kumar
//C++ code..
void main()
{
int number1,number2;
cout<<"Enter 1st number;
cin>>number1;
cout<<"Enter 2nd number;
cin>>number2;
number1=number1*number2;
number2=number1/number2;
number1=number1/number2;
getch();
}
| Is This Answer Correct ? | 0 Yes | 6 No |
main() { int i=10; void pascal f(int,int,int); f(i++,i++,i++); printf(" %d",i); } void pascal f(integer :i,integer:j,integer :k) { write(i,j,k); }
3) Int Matrix of certain size was given, We had few valu= es in it like this. =97=97=97=97=97=97=97=97=97=97=97 1 = | 4 | | 5 | &= nbsp; | 45 =97=97=97=97=97=97=97=97=97=97=97 &n= bsp; | 3 | 3 | 5 | = | 4 =97=97=97=97=97=97=97=97=97=97=97 34 |&nbs= p; 3 | 3 | | 12 | &= nbsp; =97=97=97=97=97=97=97=97=97=97=97 3 | &nbs= p; | 3 | 4 | = | 3 =97=97=97=97=97=97=97=97=97=97=97 3 | = ; | | | = ; 3 | =97=97=97=97=97=97=97=97=97=97=97 &= nbsp; | | 4 | = ; | 4 | 3 We w= ere supposed to move back all the spaces in it at the end. Note: = If implemented this prog using recursion, would get higher preference.
write a c-program to display the time using FOR loop
void main() { printf(“sizeof (void *) = %d \n“, sizeof( void *)); printf(“sizeof (int *) = %d \n”, sizeof(int *)); printf(“sizeof (double *) = %d \n”, sizeof(double *)); printf(“sizeof(struct unknown *) = %d \n”, sizeof(struct unknown *)); }
main() { int c[ ]={2.8,3.4,4,6.7,5}; int j,*p=c,*q=c; for(j=0;j<5;j++) { printf(" %d ",*c); ++q; } for(j=0;j<5;j++){ printf(" %d ",*p); ++p; } }
How do you write a program which produces its own source code as its output?
main() { char not; not=!2; printf("%d",not); }
Write a routine to draw a circle (x ** 2 + y ** 2 = r ** 2) without making use of any floating point computations at all.
2 Answers Mentor Graphics, Microsoft,
main() { int i=-1; +i; printf("i = %d, +i = %d \n",i,+i); }
main() { show(); } void show() { printf("I'm the greatest"); }
How do I write a program to print proper subset of given string . Eg :input: abc output:{},{a},{b},{c},{a,b},{a,c},{b,c}, {a,b,c}.I desperately need this program please mail me to saravana6m@gmail.com
main() { int i =10, j = 20; clrscr(); printf("%d, %d, ", j-- , --i); printf("%d, %d ", j++ , ++i); } a. 20, 10, 20, 10 b. 20, 9, 20, 10 c. 20, 9, 19, 10 d. 19, 9, 20, 10
C Code 
