added more solutions

Author: satyajitghana

.vscode/settings.json

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+{
+}

Chapter-1/Exercise 1-1/helloworld.c

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+#include <stdio.h>
+
+main() {
+	printf("hello world\n");
+}

Chapter-1/Exercise 1-10/replace2.c

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+#include <stdio.h>
+
+main() {
+    int c;
+    while ((c = getchar()) != EOF) {
+        if (c == '\t' || c == '\b' || c == '\\') printf("\\\\");
+        else putchar(c);
+    }
+}

Chapter-1/Exercise 1-12/word.c

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+#include <stdio.h>
+
+main() {
+    int c;
+    while ((c = getchar()) != EOF) {
+        if (c == ' ' || c == '\t') putchar('\n');
+        else putchar(c);
+    }
+}

Chapter-1/Exercise 1-13/histogram_vertical_2.c

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+#include <stdio.h>
+#define SIZE 15 // assuming the maximum size of a word is 15 letters long
+#define MAXHEIGHT 15 // assuming the maximum frequency of a word to be 15
+//else use another loop to determine the maximum height
+
+main() {
+    int c, count[SIZE] = {}, tmp = 0;
+    while ((c = getchar()) != EOF) {
+        if (c != ' ' && c != '\n' && c != '\t') ++tmp;
+        else {
+            ++count[tmp-1];
+            tmp = 0;
+        }
+    }
+    for (int m = 0 ; m < MAXHEIGHT ; m++) {
+        for (int i = 0 ; i < SIZE ; i++) {
+            if (count[i] != 0) {
+                if (count[i] >= MAXHEIGHT - m) putchar('#');
+                else putchar(' ');
+            }
+        }
+        putchar('\n');
+    }
+
+    for (int i = 0 ; i < SIZE ; i++) {
+        if (count[i] != 0) printf("%d", i+1);
+    }
+    putchar('\n');
+}

Chapter-1/Exercise 1-2/helloworld.c

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+#include <stdio.h>
+
+main() {
+    printf("\"hello world\"\n"); // should print "hello world"
+    //printf("\c") // throws an error since \c is not a valid escape sequence
+}

Chapter-1/Exercise 1-3/farhtocel.c

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+#include <stdio.h>
+
+main() {
+    float fahr, celsius;
+    int lower, upper, step;
+
+    lower = 0;
+    upper = 300;
+    step = 20;
+
+    fahr = lower;
+    printf("%10s %10s", "farenheit", "celsius\n");
+    while (fahr <= upper) {
+        celsius = (5.0/9.0) * (fahr - 32.0);
+        printf("%10.0f %9.2f\n", fahr, celsius);
+        fahr += step;
+    }
+}

Chapter-1/Exercise 1-4/celtofarh.c

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+#include <stdio.h>
+
+main() {
+    float celsius, fahr;
+
+    int start = 0;
+    int end = 300;
+    int step = 20;
+
+    celsius = start;
+
+    printf("%10s %10s\n", "celsius", "farenheit");
+    while (celsius <= end) {
+        fahr = ((9.0/5.0) * (celsius)) + 32.0;
+        printf("%10.0f %10.2f\n", celsius, fahr);
+        celsius += step;
+    }
+}

Chapter-1/Exercise 1-5/celtofarh.c

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+#include <stdio.h>
+
+main() {
+    printf("%10s %10s\n", "celsius", "farenheit");
+    for (float celsius = 300; celsius >= 0 ; celsius -= 20) {
+        printf("%10.0f %10.2f\n", celsius, (9.0*celsius/5.0) + 32.0);
+    }
+}

Chapter-1/Exercise 1-6/eof.c

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+#include <stdio.h>
+
+// ctrl + d produces the EOF character, which will print 0 since the realtion becomes false
+// and any other character will print 1m since the realtion is true
+main() {
+    printf("%d\n", getchar() != EOF);
+}