Q1. Given two arrays of integers output the largest number in the first array not present in the second one.

Code:-

#include<stdio.h>
int main()
{
	int n,m,i,j,c=0,temp,f=0;
	scanf("%d",&n);
	int a[n];	
	for(i=0;i<n;i++)
	{
		scanf("%d",&a[i]);
	}
	scanf("%d",&m);
	int b[m];
	for(i=0;i<m;i++)
	{
		scanf("%d",&b[i]);
	}
	for(i=0;i<n-1;i++)
	{
		for(j=0;j<n-i-1;j++)
		{
			if(a[j]>a[j+1])
			{
				temp = a[j];         
     			a[j] = a[j+1];
      			a[j+1] = temp;
			}
		}
	}
	for(i=n-1;i>=0;i--)
	{
		for(j=0;j<m;j++)
		{
			if(a[i]==b[j])
			{
				c++;
			}
		}
		if(c==0)
		{
			printf("%d",a[i]);
			f=1;
			break;
		}
		else
		{
			c=0;
		}
	}
	if(f==0)
	{
		printf("0");
	}
	return 0;
}

Q2. Write a program that replaces the occurence of a given character (say c) in a primary string (say PS) with another string (say s).

Code:-

#include<stdio.h>
int main()
{
    char PS[1000], S[10], c;
    char *ptr=PS, *ptr2=S;
    int i=0;
    scanf("%s",ptr);
    getchar();
    scanf("%c",&c);
    scanf("%s",ptr2);
    
    for( i=0;ptr[i]!='\0';i++)
    {
        if(ptr[i]==c)
        {
        printf("%s",ptr2);
        
        }
        else
        printf("%c",ptr[i]);
        
    }
return 0;    
}

Q3. Given a threshold floating point number and an array of floating point numbers strictly between 0 and 1.    Modify the array with the following rules: If the number is greater than threshold value, change it to 1 and if less     than or equal to threshold value, change to 0.

Code:-

#include<stdio.h>
int main()
{
    float farray[20];
    float tvalue;
    int sum;
    int n;
    scanf("%f", &tvalue);
    scanf("%d", &n);
    
    for (int i = 0; i < n; i++)
    {
        scanf("%f", &farray[i]);
    }
    
    for (int i = 0; i < n; i++)
    {
        if(farray[i] > tvalue)
        {
            sum = sum + 1;
        }
    }
    printf("%d", sum);
	return 0;
}