swap of two numbers in c

#include<stdio.h> 
#include<string.h> 
#include<stdlib.h> 
   
/* Swaps strings by swapping data*/
void swap2(char *str1, char *str2) 
{ 
  char *temp = (char *)malloc((strlen(str1) + 1) * sizeof(char)); 
  strcpy(temp, str1); 
  strcpy(str1, str2); 
  strcpy(str2, temp); 
  free(temp); 
}   
   
int main() 
{ 
  char str1[10] = "geeks"; 
  char str2[10] = "forgeeks"; 
  swap2(str1, str2); 
  printf("str1 is %s, str2 is %s", str1, str2); 
  getchar(); 
  return 0; 
} 

#include<stdio.h> 
  
/* Swaps strings by swapping pointers */ 
void swap1(char **str1_ptr, char **str2_ptr) 
{ 
  char *temp = *str1_ptr; 
  *str1_ptr = *str2_ptr; 
  *str2_ptr = temp; 
}   
   
int main() 
{ 
  char *str1 = "geeks"; 
  char *str2 = "forgeeks"; 
  swap1(&str1, &str2); 
  printf("str1 is %s, str2 is %s", str1, str2); 
  getchar(); 
  return 0; 
} 

// C program to swap two variables 
#include <stdio.h> 
  
int main() 
{ 
    int x, y; 
    printf("Enter Value of x "); 
    scanf("%d", &x); 
    printf("\nEnter Value of y "); 
    scanf("%d", &y); 
  
    int temp = x; 
    x = y; 
    y = temp; 
  
    printf("\nAfter Swapping: x = %d, y = %d", x, y); 
    return 0; 
}