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  • C program to swap two numbers without using third variable.
  • Yes we can swap two variables without using third variable.
  • We have four different ways to swap two numbers without using third variable.
  • Lets see an example C program on how to swap two numbers without using third variable and without using function.



Program #1: Write a simple C program to swap two numbers without using third variable

  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.   int a,b;
  7.   printf("Please enter two integer numbers to swap\n");
  8.   scanf("%d%d",&a,&b);
  9.   printf("before swapping\n");
  10.   printf("a=%d\n",a); 
  11.   printf("b=%d",b);   
  12.   
  13.     a=b+a;
  14.     b=a-b;
  15.     a=a-b;
  16.     
  17.   printf("\nafter swapping\n");
  18.   printf("a=%d\n",a); 
  19.   printf("b=%d",b); 
  20.   getch();
  21.   
  22. }

Output:


swap without third variable c program



Program #2: Write a simple C program to swap two numbers without using third variable


  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.   int a,b;
  7.   printf("Please enter two integer numbers to swap\n");
  8.   scanf("%d%d",&a,&b);
  9.   printf("before swapping\n");
  10.   printf("a=%d\n",a); 
  11.   printf("b=%d",b);   
  12.  
  13.   a=a+b-(b=a); 
  14.     
  15.   printf("\nafter swapping\n");
  16.   printf("a=%d\n",a); 
  17.   printf("b=%d",b); 
  18.   getch();
  19.   
  20. }

Output:

  1. Please enter two integers numbers to swap
  2. 30
  3. 40
  4. before swapping
  5. a=30
  6. b=40
  7. after swapping
  8. a=40
  9. b=30

Program #3: Write a simple C program to swap two numbers without using third variable : call by value

  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. int main(int argc, char *argv[])
  4. {
  5.   
  6.   int a=12, b=13;
  7.     a=a^b;
  8.     b=a^b;
  9.     a=b^a;
  10.    printf("a=%d\n",a); 
  11.  printf("b=%d",b); 
  12.   getch();
  13.   
  14. }

  Output:

  1. a=13
  2. b=12

Program #4: Write a simple C program to swap two numbers without using third variable : call by value

  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. int main(int argc, char *argv[])
  4. {
  5.   
  6.   int a=12, b=13;
  7.      a=b-~a-1;
  8.     b=a+~b+1;
  9.      a=a+~b+1;
  10.    printf("a=%d\n",a); 
  11.    printf("b=%d",b); 
  12.  
  13.  return 0;
  14.   
  15. }

  Output:

  1. a=13
  2. b=12

Instance Of Java

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