Revise the C Program so that it can store any two single-precision numbers input

Question

Revise the C Program so that it can store any two single-precision numbers inputted by function “scanf()” in two single-precision variables, and then swap the values in these two variables.

#include <stdio.h>

void swap(float *, float *); /* function prototype */

int main()
{
   float firstnum, secnum;

   printf("Enter two numbers: ");
   scanf("%f %f", &firstnum, &secnum);

   printf(" Before the call to swap() : ");
   printf(" The value in firstnum is %5.2f ", firstnum);
   printf(" The value in secnum is %5.2f ", secnum);

   return 0;
}

void swap(float *num1Addr, float *num2Addr)
{
   float temp;

   temp = *num1Addr; /* save firstnum's value */
   *num1Addr = *num2Addr; /* move secnum's value into firstnum */
   *num2Addr = temp; /* change secnum's value */
}

Explanation / Answer

#include <stdio.h>
void swap(float *, float *); /* function prototype */
int main()
{
float firstnum, secnum;
printf("Enter two numbers: ");
scanf("%f %f", &firstnum, &secnum);
printf(" Before the call to swap() : ");
printf(" The value in firstnum is %5.2f ", firstnum);
printf(" The value in secnum is %5.2f ", secnum);
swap(&firstnum,&secnum); //call the swap function
printf(" After the call to swap() : "); //value after calling the swap function
printf(" The value in firstnum is %5.2f ", firstnum); //print value of firstnum,which now contain value of secnum
printf(" The value in secnum is %5.2f ", secnum);//print value of secnum,which now contain value of firstcnum
return 0;
}
void swap(float *num1Addr, float *num2Addr)
{
float temp;
temp = *num1Addr; /* save firstnum's value */
*num1Addr = *num2Addr; /* move secnum's value into firstnum */
*num2Addr = temp; /* change secnum's value */
}

********OUTPUT*****
sh-4.3$ gcc -o main *.c   
sh-4.3$ main
Enter two numbers: 12.22 13.33
  
Before the call to swap() :   
The value in firstnum is 12.22   
The value in secnum is 13.33   
  
After the call to swap() :
The value in firstnum is 13.33   
The value in secnum is 12.22
********OUTPUT*****
Note:Code has been tested on gcc compiler,please ask in case of any doubt,Thanks.

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