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Below is a simple C program that counts the occurrences of each element in an array. This program takes an array as input from the user, counts the occurrences of each element, and then prints the count for each unique element in the array. It uses a nested loop to iterate through the array and count occurrences. Program : #include <stdio.h>int main(){int arr[100], freq[100];int size, i, j, count;printf(“Enter size of array: “);scanf(“%d”, &size);printf(“Enter elements in array: “);for(i=0; i<size; i++){scanf(“%d”, &arr[i]);freq[i] = -1;}for(i=0; i<size; i++){count = 1;for(j=i+1; j<size; j++){if(arr[i]==arr[j]){count++;freq[j] = 0;}}if(freq[i] != 0){freq[i] = count;}}printf(“\nFrequency of all elements of array : \n”);for(i=0; i<size; i++){if(freq[i] != 0){printf(“%d occurs %d times\n”, arr[i], freq[i]);}}return 0;} Output :

Below is a simple C program that searches for an element in an array and prints the index if the element is found or a message indicating that the element is not present .

To find duplicate elements in an array using a C program,you can use nested loops or hash sets. I’ll provide you with a simple example using nested loops. Here’s a sample program. Program : #include<stdio.h>#include<conio.h> void main(){int i,arr[20],j,no; printf(“Enter size of array: “);scanf(“%d”,&no);printf(“Enter any %d elements in array: “,no);for(i=0;i<no;i++){scanf(“%d”,&arr[i]);}printf(“Duplicate elements are: “);for(i=0; i<no; i++){for(j=i+1;j<no;j++){if(arr[i]==arr[j]){printf(“%d\n”,arr[i]);}}}getch();} Output :

Reversing an array in C involves swapping the elements of the array in a way that the first element becomes the last, the second becomes the second-to-last, and so on. Here’s a simple C program that reverses an array Program : #include<stdio.h>void main(){int i,length;printf(“Enter the Length of array : “);scanf(“%d”,&length);int arr[length];printf(“Enter elements into the array:”);for(i=0;i<length;i++){printf(“arr[%d] :”,i);scanf(“%d”,&arr[i]);}printf(“\nOriginal array: \n”); for ( i = 0; i < length; i++) { printf(“%d “, arr[i]); } printf(“\nArray in reverse order: \n”); for ( i = length-1; i >= 0; i–) { printf(“%d “, arr[i]); } return 0; } Output :

This program first takes a number from the user. Then, it uses a loop to convert the number to words. The loop iterates over the number, and for each digit, it prints the corresponding word from the words array. Finally, the program prints a newline character. Program : #include<stdio.h> #include<conio.h> int main(){ int n,sum=0,r; printf(“Enter the number = “); scanf(“%ld”,&n); while(n>0) { r=n%10; sum=sum*10+r; n=n/10; } n=sum; while(n>0) { r=n%10; switch(r) { case 1: printf(“one “); break; case 2: printf(“two “); break; case 3: printf(“three “); break; case 4: printf(“four “); break; case 5: printf(“five “); break; case 6: printf(“six “); break; case 7: printf(“seven “); break; case 8: printf(“eight “); break; case 9: printf(“nine “); break; case 0: printf(“zero “); break; default: printf(“tttt”); break; } n=n/10; } return 0; } Output :

Below is a simple C program that takes a range as input from the user and displays all the prime numbers within that range.

Below is a simple C program to calculate the factorial of a given number. The factorial of a non-negative integer n is the product of all positive integers less than or equal to n. The factorial is denoted by ‘n!‘. Program : #include<stdio.h> #include<conio.h> int main() { int i,n,fact=1; printf(“Enter a number : “); scanf(“%d”,&n); for(i=1;i<=n;i++) { fact=fact*i; } printf(“Factorial of %d is : %d\n”,n,fact);   } Output :

You can run this program by compiling it using a C compiler. When you run the program, it will prompt you to enter a number, and then it will display the factors of that number. Factors are the numbers that divide the given number without leaving a remainder. Program : #include <stdio.h>#include<conio.h>int main() {int num, i;printf(“Enter a positive integer: “);scanf(“%d”, &num);printf(“Factors of %d are: “, num);for (i = 1; i <= num; ++i) {if (num % i == 0) {printf(“%d “, i);}}return 0;} Output :

Sorting an array in ascending and descending order is a common task in programming. Below is a simple C program that sorts elements of an array in both ascending and descending order using the bubble sort algorithm. Program : #include <stdio.h> #include<conio.h>int main() {int a[100],n,i,j;printf(“Array size: “);scanf(“%d”,&n);printf(“Elements: “); for(i=0;i<n;i++){scanf(“%d”,&a[i]);}for ( i = 0; i < n; i++) {for ( j = 0; j < n; j++) {if (a[j] > a[i]) {int tmp = a[i]; a[i] = a[j]; a[j] = tmp; } }}printf(“\n\nAscending : “); for ( i = 0; i < n; i++) {printf(” %d “, a[i]);}for ( i = 0; i < n; i++) {for ( j = 0; j < n; j++) {if (a[j] < a[i]) {int tmp = a[i]; a[i] = a[j]; a[j] = tmp; }}}printf(“\n\nDescending : “); for ( i = 0; i < n; i++) {printf(” %d “, a[i]); }return 0; getch();} Output :

Below is a simple example of a C program to create a student marksheet. This program takes input for the student’s name, roll number, and marks in three subjects, and then calculates the total marks and percentage. Program : #include<stdio.h>#include<conio.h>int main(){int a,b,c,d,e,total;float average;printf(“Enter the Marks of First Subject : “);scanf(“%d”,&a);printf(“Enter the Marks of Second Subject : “);scanf(“%d”,&b);printf(“Enter the Marks of Third Subject : “);scanf(“%d”,&c);printf(“Enter the Marks of Fourth Subject : “);scanf(“%d”,&d);printf(“Enter the Marks of Fifth Subject : “);scanf(“%d”,&e);total=a+b+c+d+e;printf(“Total marks of the Student : %d/500”,total);average=total/5;printf(“\nAverage : %f\n”,average);if((average>=90)&&(average<=100)){printf(“Grade = A++”);}else if((average>=85)&&(average<=89)){printf(“Grade = A+”);}else if((average>=80)&&(average<=84)){printf(“Grade = A”);}else if((average>=75)&&(average<=79)){printf(“Grade = B+”);}else if((average>=70)&&(average<=74)){printf(“Grade = B”);}else if((average>=65)&&(average<=69)){printf(“Grade = C+”);}else if((average>=60)&&(average<=64)){printf(“Grade = C”);}else if((average>=55)&&(average<=59)){printf(“Grade = D+”);}else if((average>=50)&&(average<=54)){printf(“Grade = D”);}else if((average>=45)&&(average<=49)){printf(“Grade = E+”);}else if((average>=30)&&(average<=44)){printf(“Grade = E”);}else {printf(“Grade = Fail”);}return 0;} Output :