did task 1,2,3,and 4 task 4 still needs some corrections

TASKS/Task 001.c

@@ -4,4 +4,18 @@ Write a program that prints the alphabet in lowercase, followed by a new line.
 Print all the letters except q and e
 
 use printf
-*/
+*/
+#include <stdio.h>
+
+int main(void)
+{
+	char i;
+
+	for (i = 'a'; i <= 'z'; i++)
+	{
+		if (i == 'q' || i == 'e')
+			continue;
+		printf("%c\n", i);
+	}
+	return (0);
+}

TASKS/Task 002.c

@@ -3,4 +3,28 @@ Write a program that asks and reads the score of a user
 If the score is less than 80, display to the user that they
 are not elgible to be enrolled.
 If the score is greater than or equal 80, they can be enrolled.
-*/
+*/
+#include <stdio.h>
+
+int main(void)
+{
+	int score;
+	int valid_input = 0;
+	while (valid_input == 0)
+	{
+		printf("input your score: \n");
+		valid_input = scanf("%d", &score);
+		if (valid_input == 0)
+		{
+			printf("Invalid input. Please enter a number.\n");
+			scanf("%*s");
+		}
+	}
+	if (score < 80)
+		printf("you are not eligible for this course\n");
+
+	if (score >= 80)
+		printf("congratulations, you can enrol for this course\n");
+
+	return (0);
+}

TASKS/Task 003.c

@@ -6,4 +6,22 @@ If the number is zero, display 'This is zero'
 
 NOTE: 'userInput' should be the number entered by the user.
 
-*/
+*/
+#include <stdio.h>
+
+int main(void)
+{
+	int userInput;
+
+	printf("input a number\n");
+	scanf("%d\n", &userInput);
+
+	if (userInput == 0)
+		printf("You entered zero\n");
+	else if (userInput % 2 == 0)
+		printf("%d is even\n", userInput);
+	else
+		printf("%d is odd\n", userInput);
+
+	return (0);
+}	

TASKS/Task 004.c

@@ -11,4 +11,27 @@ How old are you?: 65
 Output:
 Your name is David and you are 65 years old.
 
-*/
+*/
+
+/**
+ * main - checks code
+ * Return: zero
+ */
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+	char name[50];
+	int age;
+
+	printf("Please enter your name: \n");
+	scanf("%s \n", name);
+
+	printf("input your age: \n");
+	scanf("%d \n", &age);
+
+	printf("Your name is %s and you are %d years old\n", name, age);
+
+	return (0);
+}

TASKS/Task 005.c

@@ -1,4 +1,30 @@
 /*
  Write a program in C to find the square of any number
 using the function.
-*/
+*/
+
+/**
+ * square - prints square of a number
+ * @num: number to square
+ * Return: square
+ */
+#include <stdio.h>
+int square(int num)
+{
+	return (num * num);
+}
+/**
+ * main - checks code
+ * @num: number
+ * Return: zero
+ */
+int main()
+{
+	int num;
+
+	num = 2;
+	printf("square of %d is %d\n", num, square(num));
+
+	return (0);
+}
+

TASKS/Task 006.c

@@ -1,4 +1,38 @@
 /*
 Write a program in C to check a given number is even
 or odd using the function.
-*/
+*/
+#include <stdio.h>
+
+/**
+ * checker - checks for even or odd number
+ * @num: number to check
+ * Return: 1 for odd number, 0 for even number
+ */
+
+int checker(int num)
+{
+	if (num % 2 == 0)
+		return (0);
+	else if (num % 2 == 1)
+		return (1);
+}
+
+/**
+ * main - checks code
+ * Return: 0
+ */
+int main(void)
+{
+	int num;
+	printf("Enter a number: \n");
+	scanf("%d", &num);
+
+	int result = checker(num);
+	if (result == 0)
+		printf("%d is even\n", num);
+	else
+		printf("%d is odd\n", num);
+
+	return (0);
+}

TASKS/Task 007.c

@@ -2,4 +2,30 @@
 write your solution after the comment
 Write a function that prints the alphabet, in uppercase,
 followed by a new line.
-*/
+*/
+
+/**
+ * uppercase - prints alphabets in uppercase
+ * @c: characters
+ *
+ */
+#include <stdio.h>
+
+void uppercase()
+{
+	char c;
+
+	for (char c ='A'; c <= 'Z'; c++)
+		printf("%c\n", c);
+}
+
+/**
+ * main - checks code
+ * Return: 0
+ */
+
+int main(void)
+{
+	uppercase();
+	return (0);
+}

TASKS/Task 008.c

@@ -1,4 +1,30 @@
 /*write your solution after the comment
 Write a function that prints the alphabet, in lowercase
 followed by a new line.
-*/
+*/
+
+/**
+ * lowercase - prints alphabets in lowercase
+ * @c: characters
+ *
+ */
+#include <stdio.h>
+
+void lowercase()
+{
+        char c;
+
+        for (char c ='a'; c <= 'z'; c++)
+                printf("%c\n", c);
+}
+
+/**
+ * main - checks code
+ * Return: 0
+ */
+
+int main(void)
+{
+        lowercase();
+        return (0);
+}

TASKS/Task 009.c

@@ -2,4 +2,4 @@
 Write a function that checks for lowercase character.
 That is, when passed in an arguments, it checks if the
 argument is lowercase or uppercase.
-*/
+*/