Solution to all tasks 1 - 15 - Dukeson

TASKS/README.md

@@ -1 +1,2 @@
 this directory contains tasks on each of the lessons of c programming, attempt each of them before asking or checking the solutions.
+

TASKS/Task 001.c

@@ -1,7 +1,22 @@
-/* Write your program after the comment
-Write a program that prints the alphabet in lowercase, followed by a new line.
+#include <stdio.h>
+#include <stdlib.h>
 
-Print all the letters except q and e
+/**
+ * Write your program after the comment
+ * Write a program that prints the alphabet in lowercase, followed by a new line.
+ * Print all the letters except q and e
+ * use printf
+ */
 
-use printf
-*/
+int  main(void)
+{
+        char alpha;
+
+        for (alpha = 'a'; alpha <= 'z'; alpha++)
+	{
+		if (alpha == 'e' || alpha == 'q')
+			continue;
+		printf("%c", alpha);
+	}
+        printf("\n");
+}

TASKS/Task 002.c

@@ -1,6 +1,26 @@
-/* Write your program after the comment
-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>
+#include <stdlib.h>
+#include <ctype.h>
+
+/**
+ * Write your program after the comment
+ * 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 eligible to be enrolled.
+ * If the score is greater than or equal 80, they can be enrolled. 
+ */
+
+int  main(void)
+{
+	int score = 0;
+	printf("Enter a Score:\t");
+	if (scanf("%d", &score) == 1)
+	{
+		if (score < 80)
+			printf("You are not eligible to be enrolled.");
+		else if (score >= 80)
+			printf("You can be enrolled.");
+	}
+	else
+		printf("Your input is not a numeric data.");
+	return 0;
+}

TASKS/Task 003.c

@@ -1,9 +1,23 @@
-/* Write your program after the comment
-Write a program that reads input from user (Number)
-If the number is Odd, display 'userInput is Odd'
-If the number is even, display 'userInput is even'
-If the number is zero, display 'This is zero'
+#include <stdio.h>
+#include <stdlib.h>
 
-NOTE: 'userInput' should be the number entered by the user.
+/**
+ * Write your program after the comment
+ * Write a program that reads input from user (Number)
+ * If the number is Odd, display 'userInput is Odd'
+ * If the number is even, display 'userInput is even'
+ * If the number is zero, display 'This is zero'
+ *
+ * NOTE: 'userInput' should be the number entered by the user.
+ */
 
-*/
+int main(void)
+{
+        int num = 0;
+
+        printf("Enter Number:\t");
+        scanf("%d", &num);
+
+        (num == 0) ? printf("Input is Zero") : ((num % 2 == 0) ? printf("Input is even") : printf("input is odd"));
+        return (0);
+}

TASKS/Task 004.c

@@ -1,14 +1,34 @@
-/* Write your program after the comment
-Write a program that asks and reads the following input from a use;
-Your name
-Your age
-and then displays; Your name is 'name' and you are 'age' years old.
+#include <stdio.h>
+#include <stdlib.h>
 
-Example;
-what is your name: David
-How old are you?: 65
+/**
+ * Write your program after the comment
+ * Write a program that asks and reads the following input from a use;
+ * Your name
+ * Your age
+ * and then displays; Your name is 'name' and you are 'age' years old.
+ *
+ * Example;
+ *
+ * what is your name: David
+ * How old are you?: 65
+ *
+ * Output:
+ * Your name is David and you are 65 years old.
+ */
 
-Output:
-Your name is David and you are 65 years old.
+int main(void)
+{
+        int age = 0;
+        char name[100];
 
-*/
+        printf("Enter Name:\t");
+        scanf("%s", name);
+
+        printf("Enter Age:\t");
+        scanf("%d", &age);
+
+        printf("Your name is %s and you are %d years old.", name, age);
+
+        return (0);
+}

TASKS/Task 005.c

@@ -1,4 +1,27 @@
-/*
- Write a program in C to find the square of any number
-using the function.
-*/
+#include <stdio.h>
+
+/**
+ * Write a program in C to find the square of any number
+ * using the function.
+ */
+
+ void return_square()
+ {
+        int num = 0, result;
+
+        printf("Enter a Number:\t");
+        if (scanf("%d", &num) == 1)
+                result = (num * num);
+        else
+                result = 0;
+        if (result == 0)
+                printf("\nThe data entered is not a number. The result is %d", result);
+        else
+                printf("\nThe square of %d = %d", num, result);
+ }
+
+ int main(void)
+ {
+        return_square();
+        return (0);
+ }

TASKS/Task 006.c

@@ -1,4 +1,26 @@
+#include <stdio.h>
 /*
 Write a program in C to check a given number is even
 or odd using the function.
-*/
+*/
+void type_checker()
+{
+        int num = 0;
+
+        printf("Enter a Number:\t");
+        if (scanf("%d", &num) == 1)
+        {
+                if ((num % 2) == 0)
+                        printf("\nThe number %d is an even number.", num);
+                else
+                        printf("\nThe number %d is an odd number.", num);
+        }
+        else
+                printf("\nThe data entered is not a number.");
+
+}
+int main(void)
+{
+        type_checker();
+        return (0);
+}

TASKS/Task 007.c

@@ -1,5 +1,38 @@
+#include <stdio.h>
+#include <ctype.h>
+
 /*
 write your solution after the comment
 Write a function that prints the alphabet, in uppercase,
 followed by a new line.
-*/
+*/
+
+void to_upper_case_one()
+{
+        char n;
+
+        for (n = 'A'; n <= 'Z'; n++)
+        {
+                printf("%c", n);
+        }
+        printf("\n");
+}
+
+void to_upper_case_two()
+{
+        char n;
+
+        for (n = 'a'; n <= 'z'; n++)
+        {
+                printf("%c", toupper(n));
+        }
+        printf("\n");
+}
+
+int main(void)
+{
+        to_upper_case_one();
+        to_upper_case_two();
+
+        return (0);
+}

TASKS/Task 008.c

@@ -1,4 +1,37 @@
+#include <stdio.h>
+#include <ctype.h>
+
 /*write your solution after the comment
 Write a function that prints the alphabet, in lowercase
 followed by a new line.
-*/
+*/
+
+void to_lower_case_one()
+{
+        char n;
+
+        for (n = 'a'; n <= 'z'; n++)
+        {
+                printf("%c", n);
+        }
+        printf("\n");
+}
+
+void to_lower_case_two()
+{
+        char n;
+
+        for (n = 'A'; n <= 'Z'; n++)
+        {
+                printf("%c", tolower(n));
+        }
+        printf("\n");
+}
+
+int main(void)
+{
+        to_lower_case_one();
+        to_lower_case_two();
+
+        return (0);
+}

TASKS/Task 009.c

@@ -1,5 +1,28 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+
 /*write your solution after the comment
 Write a function that checks for lowercase character.
 That is, when passed in an arguments, it checks if the
 argument is lowercase or uppercase.
-*/
+*/
+void check_case(char chr)
+{
+        if ( chr >= 'a' && chr <= 'z')
+                printf("\n%c is a lower cased character.", chr);
+        else if (chr >= 'A' && chr <= 'Z')
+                printf("\n%c is an upper cased character.", chr);
+        else
+                printf("\nKindly provide a character.");
+}
+int main(void)
+{
+        char str;
+
+        printf("Enter a character:\t");
+        scanf("%c", &str);
+        check_case(str);
+
+        return (0);
+}

TASKS/Task 010.c

@@ -1,5 +1,30 @@
+#include <stdio.h>
+
 /*write your solution after the comment
 Write a function that computes the absolute
 value of an integer.
 Understand what an absolute value is, before attempting it.
-*/
+*/
+int get_absolute(int num)
+{
+        if (num < 0)
+                num *= -1;
+        return (num);
+}
+
+int main(void)
+{
+        int num = 0;
+        int result = 0;
+
+        printf("Enter a Number:\t");
+        if (scanf("%d", &num) == 1)
+        {
+                result = get_absolute(num);
+                printf("The absolute value of %d = %d", num, result);
+        }
+        else
+                printf("\nThe data entered is not a number.");
+
+        return (0);
+}

TASKS/Task 011.c

@@ -1,3 +1,5 @@
+#include <stdio.h>
+
 /*write your solution after the comment
 Write a function that prints the 9 times table,
 starting with 0.
@@ -6,4 +8,18 @@ Output should look like this;
 9 x 1 = 9
 9 x 2 = 18
 ... and so on till 12
-*/
+*/
+
+void times_table()
+{
+        int i = 9, j;
+
+        for (j = 0; j <= 12; j++)
+                printf("%d * %d = %d\n", i, j, (i * j));
+        printf("\n");
+}
+int main(void)
+{
+        times_table();
+        return (0);
+}