7.1 standard input output

Gurjaka · Gurjaka · commit 637c0ee33c77 · 2025-05-01T23:49:58.000+04:00
diff --git a/src/chapter-7:input-output/7.1-standard-input-output/arbitrary_in_out.c b/src/chapter-7:input-output/7.1-standard-input-output/arbitrary_in_out.c
@@ -0,0 +1,45 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define LINE 80
+
+int main(void)
+{
+    int c, col = 0;
+    while ((c = getchar()) != EOF)
+    {
+        if (isprint(c))
+        {
+            putchar(c);
+            col++;
+        }
+        else if (c == '\n')
+        {
+            printf("\\n");
+            col += 2;
+        }
+        else if (c == '\t')
+        {
+            printf("\\t");
+            col += 2;
+        }
+        else if (c == '\b')
+        {
+            printf("\\b");
+            col += 2;
+        }
+        else
+        {
+            printf("\\x%02X", c); // hex representation
+            col += 4;
+        }
+
+        if (col >= LINE)
+        {
+            putchar('\n');
+            col = 0;
+        }
+    }
+    return EXIT_SUCCESS;
+}
diff --git a/src/chapter-7:input-output/7.1-standard-input-output/convert.c b/src/chapter-7:input-output/7.1-standard-input-output/convert.c
@@ -0,0 +1,28 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char* argv[])
+{
+    if (!argc)
+        return EXIT_FAILURE;
+
+    int (*convert)(int) = NULL;
+    if (strstr(argv[0], "upper"))
+    {
+        convert = toupper;
+    }
+    else if (strstr(argv[0], "lower"))
+    {
+        convert = tolower;
+    }
+
+    int c;
+
+    while ((c = getchar()) != EOF)
+    {
+        putchar(convert(c));
+    }
+    return EXIT_SUCCESS;
+}
