#include<stdio.h>
int main(){
    int a,b,temp;
   
    printf("Enter any two integers: ");
    scanf("%d%d",&a,&b);
    printf("Before swapping: a = %d, b=%d",a,b);

    temp = a;
    a = b;
    b = temp;
    printf("\nAfter swapping: a = %d, b=%d",a,b);

    return 0;
}

#include<stdio.h>

int main(){

    int a,b;
    int *ptra,*ptrb;
    int *temp;

    printf("Enter any two integers: ");
    scanf("%d%d",&a,&b);

    printf("Before swapping: a = %d, b=%d",a,b);

    ptra = &a;
    ptrb = &b;

     temp = ptra;
    *ptra = *ptrb;
    *ptrb = *temp;

    printf("\nAfter swapping: a = %d, b=%d",a,b);
    return 0;
}
Sample output:
Enter any two integers: 5 10
Before swapping: a = 5, b=10
After swapping: a = 10, b=10

#include<stdio.h>

void swap(int *,int *);
int main(){

    int a,b;
   
    printf("Enter any two integers: ");
    scanf("%d%d",&a,&b);

    printf("Before swapping: a = %d, b=%d",a,b);

    swap(&a,&b);

    printf("\nAfter swapping: a = %d, b=%d",a,b);
    return 0;
}

void swap(int *a,int *b){
    int *temp;
    temp = a;
    *a=*b;
    *b=*temp;
}
Sample output:
Enter any two integers: 3 6
Before swapping: a = 3, b=6
After swapping: a = 6, b=6

#include<stdio.h>
int main(){
  int n,num,i;
  int big;
  
  printf("Enter the values of n: ");
  scanf("%d",&n);
 
  printf("Number %d",1);
  scanf("%d",&big);

  for(i=2;i<=n;i++){
    printf("Number %d: ",i);
    scanf("%d",&num);

    if(big<num)
      big=num;
  }
  
  printf("Largest number is: %d",big);

  return 0;
}
Sample Output:
Enter the values of n:
Number 1: 12
Number 2: 32
Number 3: 35
Largest number is: 35

#include<stdio.h>
int main(){
  int num,temp,factor=1;

  printf("Enter a number: ");
  scanf("%d",&num);

  temp=num;
  while(temp){
      temp=temp/10;
      factor = factor*10;
  }

  printf("Each digits of given number are: ");
  while(factor>1){
      factor = factor/10;
      printf("%d ",num/factor);
      num = num % factor;
  }

  return 0;
}
Sample output:
Enter a number: 123
Each digits of given number are: 1 2 3