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Arrays in C : Examples
C program to find the summation of a series of numbers using an array:
#include <stdio.h>
int main()
{
int
numbers[100]; // Array to store numbers
int totalElements,
sum = 0;
// Ask user for total number of elements
printf("Enter total
number of elements: ");
scanf("%d", &totalElements);
// Check if number of elements is within
valid range
if (totalElements
<= 0 || totalElements > 100) {
printf("Please enter a number between 1 and 100.\n");
return 1; //
Exit the program
}
// Taking input for array elements
printf("\nEnter %d numbers:\n", totalElements);
for (int i = 0; i
< totalElements; i++) {
printf("Number %d: ", i + 1);
scanf("%d", &numbers[i]);
sum += numbers[i]; // Add each number to sum
}
// Display the summation
printf("\nSummation of the series = %d\n", sum);
return 0;
}
C program to find the largest among a series of numbers using an array:
#include <stdio.h>
int main()
{
int numbers[100];
int totalElements,
largest;
// Ask user for the
number of elements
printf("Enter
total number of elements: ");
scanf("%d", &totalElements);
// Check for valid
input
if (totalElements
<= 0 || totalElements > 100) {
printf("Please enter a number
between 1 and 100.\n");
return 1;
}
// Input numbers
from the user
printf("\nEnter %d numbers:\n", totalElements);
for (int i = 0; i
< totalElements; i++) {
printf("Number %d: ", i + 1);
scanf("%d", &numbers[i]);
}
// Assume the first
number is the largest
largest =
numbers[0];
// Compare with the
rest of the numbers
for (int i = 1; i
< totalElements; i++) {
if (numbers[i]
> largest) {
largest =
numbers[i];
}
}
// Display the
largest number
printf("\nThe
largest number is: %d\n", largest);
return 0;
}
c program to find the even numbers in a series of numbers using an array
#include <stdio.h>
int main()
{
int numbers[100];
int totalElements;
// Ask user for the
number of elements
printf("Enter
total number of elements: ");
scanf("%d", &totalElements);
// Check for valid
input
if (totalElements
<= 0 || totalElements > 100) {
printf("Please
enter a number between 1 and 100.\n");
return 1;
}
// Input numbers
from the user
printf("\nEnter %d numbers:\n", totalElements);
for (int i = 0; i
< totalElements; i++) {
printf("Number %d: ", i + 1);
scanf("%d", &numbers[i]);
}
// Display even
numbers
printf("\nEven
numbers in the series are:\n");
int found = 0;
for (int i = 0; i
< totalElements; i++) {
if (numbers[i]
% 2 == 0) {
printf("%d ", numbers[i]);
found = 1;
}
}
if (!found) {
printf("No
even numbers found.");
}
printf("\n");
return 0;
}
## Write a
C program and declare an integer type array with capacity 7. Take input to the
array from the keyboard. Display the 8th element of the array. Hint: display
num[7] if num is the name of the array. Analyze the output.
#include <stdio.h>
int main() {
int num[7];
int i;
// Input from the user
printf("Enter
7 integers:\n");
for (i = 0; i <
7; i++) {
scanf("%d", &num[i]);
}
// Trying to access the 8th element (index
7)
printf("The
8th element (num[7]) is: %d\n", num[7]);
return 0;
}
# Write a C program and declare an integer type array with 7
elements in it. Display the address of the individual elements in the array.
#include <stdio.h>
int main() {
int arr[7];
int i;
printf("Enter
7 integers:\n");
for (i = 0; i <
7; i++) {
scanf("%d", &arr[i]);
}
printf("Addresses of individual elements in the array:\n");
for (i = 0; i <
7; i++) {
printf("Address of arr[%d]: %p\n", i, (void*)&arr[i]);
}
return 0;
}
## Write a C program and declare two integer type arrays,
each with capacity 7. Take input only to the first array. Write a loop to copy
the elements of the first array to the second one. Display the elements of the
second array.
#include <stdio.h>
int main() {
int arr1[7],
arr2[7];
int i;
printf("Enter
7 integers for the first array:\n");
for (i = 0; i <
7; i++) {
scanf("%d", &arr1[i]);
}
// Copy elements from arr1 to arr2
for (i = 0; i <
7; i++) {
arr2[i] = arr1[i];
}
// Display elements of arr2
printf("Elements of the second array:\n");
for (i = 0; i <
7; i++) {
printf("arr2[%d] = %d\n", i, arr2[i]);
}
return 0;
}
## Write a c program to find the summation of the series 1+2+3+4+5+........+n
#include <stdio.h>
int main() {
int n, sum = 0;
// Ask the user for input
printf("Enter
a positive integer n: ");
scanf("%d", &n);
// Check if the input is positive
if (n < 1) {
printf("Please enter a positive integer greater than 0.\n");
return 1;
}
// Calculate the sum using a loop
for (int i = 1; i
<= n; i++) {
sum += i;
}
// Print the result
printf("The
summation of the series 1 + 2 + ... + %d is: %d\n", n, sum);
return 0;
}
## a c program to find the all even numbers in a series of numbers using array.
#include <stdio.h>
int main() {
int n, i;
printf("Enter
the number of elements: ");
scanf("%d", &n);
int
numbers[n]; // Declare array of size n
printf("Enter
%d numbers:\n", n);
for(i = 0; i <
n; i++) {
scanf("%d", &numbers[i]);
}
printf("Even
numbers in the series are:\n");
for(i = 0; i <
n; i++) {
if(numbers[i] %
2 == 0) {
printf("%d ", numbers[i]);
}
}
printf("\n");
return 0;
}
### A C program to find the largest number among a series using an array.
#include <stdio.h>
int main() {
int n, i, largest;
printf("Enter
the number of elements: ");
scanf("%d", &n);
int numbers[n]; // Declare array of size n
printf("Enter
%d numbers:\n", n);
for(i = 0; i <
n; i++) {
scanf("%d", &numbers[i]);
}
largest =
numbers[0]; // Assume first element is
the largest
for(i = 1; i <
n; i++) {
if(numbers[i]
> largest) {
largest =
numbers[i];
}
}
printf("The
largest number is: %d\n", largest);
return 0;
}
## A c program to search a number from a series of numbers using an array.
#include <stdio.h>
int main() {
int n, i, search,
found = 0;
printf("Enter
the number of elements: ");
scanf("%d", &n);
int
numbers[n]; // Declare array of size n
printf("Enter
%d numbers:\n", n);
for(i = 0; i <
n; i++) {
scanf("%d", &numbers[i]);
}
printf("Enter
the number to search: ");
scanf("%d", &search);
for(i = 0; i <
n; i++) {
if(numbers[i]
== search) {
found = 1;
break; // Exit loop when number is found
}
}
if(found)
{
printf("Number %d found at position %d (index %d)\n", search,
i + 1, i);
}
else {
printf("Number %d not found in the array.\n", search);
}
return 0;
}
## a c program to handle a char array as string.
#include <stdio.h>
int main() {
char str[100];
printf("Enter
a string: ");
fgets(str, 100,
stdin);
printf("You
entered: %s", str);
return 0;
}
## write a c program to display the string characters.
#include <stdio.h>
int main() {
char str[100]; // Declare a string of max size 100
int i = 0;
// Ask the user to
input a string
printf("Enter
a string: ");
fgets(str,
sizeof(str), stdin); // Reads input
including spaces
// Display each
character in the string
printf("Characters in the string:\n");
while (str[i] !=
'\0') {
printf("Character %d: %c\n", i, str[i]);
i++;
}
return 0;
}
## write a c program to find the largest number among a series of numbers using an array
#include <stdio.h>
int main() {
int n, i;
float numbers[100], max;
// Ask user for number of elements
printf("Enter the number of elements (up to 100): ");
scanf("%d", &n);
// Validate input
if (n <= 0 || n > 100) {
printf("Invalid number of elements.\n");
return 1;
}
// Input numbers
printf("Enter %d numbers:\n", n);
for (i = 0; i < n; i++) {
printf("Number %d: ", i + 1);
scanf("%f", &numbers[i]);
}
// Initialize max with first element
max = numbers[0];
// Find the largest number
for (i = 1; i < n; i++) {
if (numbers[i] > max) {
max = numbers[i];
}
}
// Display the result
printf("The largest number is: %.2f\n", max);
return 0;
}