Write a program which interchanges the values the variable using only assignments operations.what is the minimum no of assignments operations required.

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java c++ or php which one of them?
in c language
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#include <stdio.h>
main ()
      int  a, b ;
            printf("Input a: "); scanf("%d", &a);
            printf("Input b: "); scanf("%d", &b);
            a = (a+b) ;
            printf ("values a: %d , %d\n", a, b);
            b = (a-b) ;   // now b = original value of a
            printf ("values a: %d , %d\n", a, b);
            a = (a - b ) ; // now a = original value of b
            printf ("values a: %d , %d\n", a, b);

minimum number of assignments needed = 3