some improvements

08/exercises/11/README.md

@@ -29,3 +29,10 @@ for (i = 0; i < 8; i++) {
     }
 }
 ```
+
+### Solution2
+```c
+char checker_board [8][8];
+    for (unsigned char i =0; i<8; i++)
+        for (unsigned char j = 0; j<8; checker_board[i][j] = !((i+j++)%2)? 'B': 'R');
+```

08/projects/01/1.c

@@ -30,3 +30,18 @@ int main(void) {
     printf("\n");
     return 0;
 }
+
+//how about this?
+bool digit_seen[10] = {false};
+  int digit;
+  long n;
+
+  printf("Enter a number: ");
+  scanf("%ld", &n);
+printf("repeated digits: ");
+  while (n > 0) {
+    digit = n % 10;
+    if (digit_seen[digit]) printf("%d ",digit);
+    digit_seen[digit] = true;
+    n /= 10;
+  }

08/projects/03/3.c

@@ -1,36 +1,33 @@
 /* Checks numbers for repeated digits */
 
+#include <stdbool.h>   /* C99 only */
 #include <stdio.h>
 
-int main(void) {
-
-    int digit, i, occurrences[10] = {0};
-    long n;
-
-    printf("Enter a number: ");
-    scanf("%ld", &n);
-
-    if (n <= 0) {
-        printf("Digit:\t\t 0  1  2  3  4  5  6  7  8  9\n");
-        printf("Occurrences:\t 0  0  0  0  0  0  0  0  0  0\n");
-    }
-
-    while (n > 0) {        
-        while (n > 0) {
-            digit = n % 10;
-            occurrences[digit]++;
-            n /= 10;
-        }
-
-        printf("Digit:\t\t 0  1  2  3  4  5  6  7  8  9\n");
-        printf("Occurrences:\t");
-
-        for (i = 0; i < 10; i++) {
-            printf("%2d ", occurrences[i]);
-            occurrences[i] = 0;
-        }
-        printf("\nEnter a number: ");
-        scanf("%ld", &n);
-    }
-    return 0;
+
+int main(void)
+{
+  unsigned char my_array[10];
+
+  long n;
+
+  long b;
+
+  for(unsigned char i=0;i<10;my_array[i++]=0);
+
+  printf("Enter numbers ... enter 0 to terminate: ");
+
+do{
+
+  scanf("%ld", &b);
+  n=b;
+  for(;n;my_array[n%10]++,n/=10);
+
+}while(b>0);
+
+  printf("0 1 2 3 4 5 6 7 8 9 10\n");
+
+ for(unsigned char i=0;i<10;printf("%d ",my_array[i++]));
+
+  return 0;
 }
+

08/projects/06/6.c

@@ -43,3 +43,37 @@ int main(void) {
 
     return 0;
 }
+
+//How about this?
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <ctype.h>
+#define MAX_SIZE 100
+int main(void)
+{
+
+char message[MAX_SIZE]={0};
+
+printf("Enter message: ");
+
+char c;
+
+unsigned char counter=0;
+
+while((c=toupper(getchar()))!='\n' && counter<MAX_SIZE){
+
+switch(c){
+case 'A': message[counter++]='4';break;
+case 'B': message[counter++]='8';break;
+case 'E': message[counter++]='3';break;
+case 'I': message[counter++]='1';break;
+case 'O': message[counter++]='0';break;
+case 'S': message[counter++]='5';break;
+default: message[counter++]=c;break;
+}
+
+}
+printf("Translated message: %s!!!!!!!!!!\n",message);
+   return 0;
+}

08/projects/07/7.c

@@ -1,38 +1,80 @@
 #include <stdio.h>
+#include <stdlib.h>
 
-int main(void) {
+#define rows 5
+#define cols 5
 
-    int i, j, temp_total;
-    int n[5][5];
+int main()
+{
+ int array[rows][cols];
 
-    for (i = 0; i < 5; i++) {
-        printf("Enter row %d: ", i + 1);
+unsigned char row_sum=0;
 
-        for (j = 0; j < 5; j++) {
-            scanf("%d", &n[i][j]);
-        }
+unsigned char col_sum=0;
+
+
+ for(unsigned char i=0;i<rows;i++){
+    printf("enter row %d:",i+1);
+
+    unsigned char b=0;
+
+    while(b<5) scanf("%d",&array[i][b++]);
+
+ }
+
+ printf("Row totals: ");
+ for(unsigned char i=0;i<5;i++){
+
+    for(unsigned char b=0;b<5;b++){
+        row_sum+=array[i][b];
     }
+    printf("%2d ",row_sum);
+    row_sum=0;
+ }
+ putchar('\n');
 
-    printf("Row totals: ");
+ printf("Col totals: ");
+ for(unsigned char i=0;i<5;i++){
 
-    for (i = 0; i < 5; i++) {
-        temp_total = 0;
-        for (j = 0; j < 5; j++) {
-            temp_total += n[i][j];
-        }
-        printf("%d ", temp_total);
+    for(unsigned char b=0;b<5;b++){
+        col_sum+=array[b][i];
     }
+    printf("%2d ",col_sum);
+    col_sum=0;
+ }
+ putchar('\n');
+    return 0;
+}
 
-    printf("\nColumn totals: ");
-    for (i = 0; i < 5; i++) {
-        temp_total = 0;
-        for (j = 0; j < 5; j++) {
-            temp_total += n[j][i];
+//how about this?
+#include <stdio.h>
+
+#define ROWS 5
+#define COLS 5
+
+int main(void)
+{
+int array[ROWS][COLS]={0};
+int row_sum[ROWS]={0};
+int col_sum[COLS]={0};
+
+for(int i=0;i<ROWS && printf("Enter row %d:",i+1);i++)
+        for(int b=0;b<ROWS;scanf(" %d",&array[i][b++]));
+
+printf("Row totals: ");
+for(int i=0;i<ROWS;){
+        for(int b=0;b<ROWS;){
+        row_sum[i]+=array[i][b];
+        col_sum[i]+=array[b++][i];
         }
-        printf("%d ", temp_total);
-    }
+printf("%d ",row_sum[i++]);
+}
 
-    printf("\n");
+printf("\ncol totals: ");
 
-    return 0;
+for(int i=0;i<ROWS;printf("%d ",col_sum[i++]));
+
+putchar('\n');
+
+   return 0;
 }

08/projects/08/8.c

@@ -1,48 +1,56 @@
 #include <stdio.h>
+#include <stdlib.h>
 
-int main(void) {
+#define rows 5
+#define cols 5
 
-    int i, j, temp_total, high, low;
-    int n[5][5];
+int main()
+{
+ int array[rows][cols];
 
-    for (i = 0; i < 5; i++) {
-        printf("Enter quiz grades for student %d: ", i + 1);
+unsigned char student_total_score=0;
 
-        for (j = 0; j < 5; j++) {
-            scanf("%d", &n[i][j]);
-        }
-    }
+unsigned char col_sum=0;
 
-    printf("\n");
+ for(unsigned char i=0;i<rows;i++){
+    printf("Grades for Student %d:",i+1);
 
-    for (i = 0; i < 5; i++) {
-        printf("\nTotal and average score for student %d: ", i + 1);
-        temp_total = 0;
-        for (j = 0; j < 5; j++) {
-            temp_total += n[i][j];
-        }
-        printf("%d %.2f", temp_total, (double) temp_total / 5);
-    }
+    unsigned char b=0;
 
-    printf("\n");
-
-    for (i = 0; i < 5; i++) {
-        printf("\nAverage, high and low scores for quiz %d: ", i + 1);
-        temp_total = 0;
-        high = low = n[0][i];
-
-        for (j = 0; j < 5; j++) {
-            temp_total += n[j][i];
-            if (n[j][i] > high)
-                high = n[j][i];
-            if (n[j][i] < low)
-                low = n[j][i];
-        }
-        printf("%f %d %d", (double) temp_total / 5, high, low);
-    }
+    while(b<5) scanf("%d",&array[i][b++]);
+
+ }
+putchar('\n');
 
-    printf("\n");
+ for(unsigned char i=0;i<5;i++){
+printf("Total score for Student%d: ",i+1);
+
+    for(unsigned char b=0;b<5;b++){
+        student_total_score+=array[i][b];
+    }
+    printf("%d ",student_total_score);
+    printf("Average Score %.2f ",(float)student_total_score/rows);
+    putchar('\n');
+    student_total_score=0;
+ }
+printf("\n\n");
+
+ unsigned char low=255;
+ unsigned char high=0;
+
+ for(unsigned char i=0;i<5;i++){
+        printf("Quiz %d: ",i+1);
+
+    for(unsigned char b=0;b<5;b++){
+        col_sum+=array[b][i];
+        if(array[b][i]<low) low=array[b][i];
+        if(array[b][i]>high) high=array[b][i];
+    }
+    printf("Average: %.2f Low: %d High: %d\n",(float)col_sum/cols,low,high);
 
+    col_sum=0;
+ }
+ putchar('\n');
 
     return 0;
 }