Put everything in folders

vagen_till_c/ch2/average.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main()
+{
+    float nr1, nr2;
+    printf("First number: ");
+    scanf("%f", &nr1);
+    printf("Second number: ");
+    scanf("%f", &nr2);
+    printf("Total: %.2f\n", nr1+nr2);
+    printf("Average: %.2f\n", (nr1+nr2)/2);
+    return 0;
+}

vagen_till_c/ch2/average_biggest.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+/* A program to calculate the average of a set of numbers and the biggest
+ * of those numbers. From the book "Vägen till C". Translated it to english.
+ */
+
+int main()
+{
+    float nr, sum, biggest;
+    int ant;
+    sum = 0;
+    biggest = 0;
+    ant = 0;
+
+    printf("Write the numbers.\n");
+    printf("Finish with EOF.\n"); // EOF is CTRL-D in Unix/Linux
+    while (scanf("%f", &nr) == 1) // As long as we get characters to scanf, it's
+    {                             // true, ie '1'.
+        ant++;
+        sum += nr;                // Same as sum = sum + nr.
+        if (nr > biggest)         // If 'nr' is bigger than 'biggest', make 'nr'
+        {                         // the new 'biggest' value.
+            biggest = nr;
+        }
+    }
+    
+    printf ("Average:    %.3f\n", sum / ant);
+    printf ("Biggest:    %.3f\n", biggest);
+ 
+   return 0;
+}

vagen_till_c/ch2/avg_with_function.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+
+/* A first example from the book "Vägen till C" where we get to use functions.
+ * Here is a function to get the biggest number from a set of numbers.
+ */
+
+float max(float x, float y) // It's return value is a float.
+{
+    if (x > y)
+    {
+        return x;
+    }
+    else
+    {
+        return y;
+    }
+}
+
+int main() // main's return value is an int (return 0 at the bottom).
+{
+    float number, sum, biggest;
+    int ant;
+    sum = 0;
+    biggest = 0;
+    ant = 0;
+
+    printf("Write the numbers\nFinish with EOF\n");
+    
+    while (scanf("%f", &number) == 1)
+    {
+        ant++;
+        sum += number;
+        biggest = max(biggest, number); // biggest goes into x, number into y.
+    }
+
+    printf("Average:    %.2f\n", sum / ant);
+    printf("Biggest:    %.2f\n", biggest);
+
+    return 0;
+}

vagen_till_c/ch2/interest1.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#define YEARS 15
+
+/* Simple example of a program to calculate interest on interest */
+
+int main()
+{
+    float cap, interest;
+    int year;
+    printf("Invested capial: "); scanf("%f", &cap);
+    printf("Interest? "); scanf("%f", &interest);
+    printf("\n Year      Holding\n ====      =======\n");
+
+    for (year = 1; year <= YEARS; year++)
+    {
+        cap = cap * (1 + interest / 100);
+        printf("%5d%13.2f\n", year, cap);
+    }
+    return 0;
+}

vagen_till_c/ch2/interest2.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+int main()
+{
+    float cap, interest;
+    int year;
+    int nrOfYears;
+    printf("Invested capial: "); scanf("%f", &cap);
+    printf("Interest? "); scanf("%f", &interest);
+    printf("How many years? "); scanf("%d", &nrOfYears);
+    printf("\n Year     Holding\n ====      =======\n");
+
+    for (year = 1; year <= nrOfYears; year++)
+    {
+        cap = cap * (1 + interest / 100);
+        printf("%5d%13.2f\n", year, cap);
+    }
+    return 0;
+}

vagen_till_c/ch2/interest3.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+/* A simple program from the book "Vägen till C" to calculate for how long your
+ * money will have to sit in the bank at a given interest rate to reach the
+ * amount of money you'll want
+ */
+
+int main()
+{
+    float cap, want, interest;
+    int year;
+
+    printf("Invested capital: "); scanf("%f", &cap);
+    printf("Want sum: "); scanf("%f", &want);
+    printf("Interest? "); scanf("%f", &interest);
+    
+    year = 0;
+
+    /* As long as your capital at the bank is less than you want, keep rerunning
+     * the loop until we reach the amout we want. Each loop is one year.
+     */ 
+    while (cap < want)
+    {
+        year = year + 1;
+        cap = cap * (1 + interest / 100);
+    }
+
+    printf("The capital will have to be at the bank for %d years\n", year);
+    return 0;
+}