Chapter4

DeitelC/Chapter4/asciiPrint.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main(void) {
+
+    for(int i = 0; i < 128; i++) {
+        if(i % 10 == 0) {
+            printf(" %c\n", i);
+        } else {
+            printf(" %c", i);
+        }
+    }
+return 0;
+}

DeitelC/Chapter4/calculateSales.c

@@ -2,6 +2,35 @@
 
 int main (void){
     int i, j;
+    float total = 0;
+    while(1) {
+        puts("Enter item number and how many sold: ");
+        scanf("%d%d", &i, &j);
+        if(i == 0) {
+        break;
+        }
 
-
+        switch(i) {
+        default:
+            puts("Invalid value!");
+            continue;
+        case 1:
+            total += 2.98 * j;
+            break;
+        case 2:
+            total += 4.50 * j;
+            break;
+        case 3:
+            total += 9.98 * j;
+            break;
+        case 4:
+            total += 4.49 * j;
+            break;
+        case 5:
+            total += 6.87 * j;
+            break;
+        }
+    }
+    printf("Last weeks total retail price: %.2f\n", total);
+return 0;
 }

DeitelC/Chapter4/diamond.c

@@ -0,0 +1,48 @@
+#include <stdio.h>
+
+int main(void) {
+    int odd;
+
+    // Prompt user for input
+    puts("Enter an odd number: ");
+    if (!scanf("%d", &odd) || odd % 2 == 0) {
+        puts("Enter a valid odd integer!");
+        return 1;
+    }
+
+    int mid = odd / 2; // Middle point of the diamond
+
+    // Upper half of the diamond
+    for (int i = 0; i < mid; i++) {
+        // Print leading spaces
+        for (int j = 0; j < mid - i; j++) {
+            printf(" ");
+        }
+        // Print asterisks
+        for (int j = 0; j < 2 * i + 1; j++) {
+            printf("*");
+        }
+        printf("\n");
+    }
+
+    // Middle line of the diamond
+    for (int i = 0; i < odd; i++) {
+        printf("*");
+    }
+    printf("\n");
+
+    // Lower half of the diamond
+    for (int i = mid - 1; i >= 0; i--) {
+        // Print leading spaces
+        for (int j = 0; j < mid - i; j++) {
+            printf(" ");
+        }
+        // Print asterisks
+        for (int j = 0; j < 2 * i + 1; j++) {
+            printf("*");
+        }
+        printf("\n");
+    }
+
+    return 0;
+}

DeitelC/Chapter4/exercise4-24.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main(void) {
+
+    int i = 5, j = 7, k = 4, m = -2;
+
+printf("%d\n", i == 5);
+printf("%d\n", j != 3);
+printf("%d\n", i >= 5 && j < 4);
+printf("%d\n", !m && k > m);
+printf("%d\n", !k || m);
+printf("%d\n", k - m < j || 5 - j >= k);
+printf("%d\n", j + m <= i && !0);
+printf("%d\n", !(j - m));
+printf("%d\n", !(k > m));
+printf("%d\n", !(j > k));
+printf("%d\n", !m);
+}

DeitelC/Chapter4/integerConverter.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+int main(void) {
+    for (int i = 0; i < 257; i++) {
+        int t = i;
+        int binary = 0;
+        int mult = 1;
+
+        while (t > 0) {
+            binary += (t % 2) * mult;
+            t /= 2;
+            mult *= 10;
+        }
+
+        printf("Int: %d, Bin: %d, Octal: %o, Hex: %X\n", i, binary, i, i);
+    }
+
+    return 0;
+}
+

DeitelC/Chapter4/pi.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main(void){
+
+    float pi = 4.0;
+    int sign = -1;
+    for (int i = 3; i < 8092; i += 2) {
+        pi += sign*(4.0/i);
+        sign = -sign;
+    }
+printf("%.6f\n",pi);
+}

DeitelC/Chapter4/test2.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+
+int main(void) {
+    int odd;
+
+    // Prompt user for input
+    puts("Enter an odd number: ");
+    if (!scanf("%d", &odd) || odd % 2 == 0) {
+        puts("Enter a valid odd integer!");
+        return 1;
+    }
+
+    // Print the diamond pattern
+    int mid = odd / 2; // Middle point of the diamond
+
+    // Upper half of the diamond
+    for (int i = 0; i < mid; i++) {
+        // Print leading spaces
+        for (int j = 0; j < mid - i; j++) {
+            printf(" ");
+        }
+        // Print asterisks
+        for (int j = 0; j < 2 * i + 1; j++) {
+            printf("*");
+        }
+        printf("\n");
+    }
+
+    // Middle line of the diamond
+    for (int i = 0; i < odd; i++) {
+        printf("*");
+    }
+    printf("\n");
+
+    // Lower half of the diamond
+    for (int i = mid - 1; i >= 0; i--) {
+        // Print leading spaces
+        for (int j = 0; j < mid - i; j++) {
+            printf(" ");
+        }
+        // Print asterisks
+        for (int j = 0; j < 2 * i + 1; j++) {
+            printf("*");
+        }
+        printf("\n");
+    }
+
+    return 0;
+}