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--- cs_lang:c [2011/07/12 10:37] – [Hello World] cedric
+++ cs_lang:c [2012/09/30 23:32] (current) – cedric
@@ Line 15: / Line 15: @@
 {
     printf("Hello World");
 }
 </code>
@@ Line 29: / Line 27: @@
 $ ./hello.out
 Hello World
+</code>
+===== Increment a number =====
+<code c>
+#include "stdio.h"
+char  line[100];
+int   value;
+int main()
+{
+    printf("Enter a value:");
+    fgets(line, sizeof(line), stdin);
+    sscanf(line, "%d", &value);
+    printf("Inc: %d\n", value + 1);
+    return 0;
+}
+</code>
+<code bash>
+$ gcc -Wall test1.c
+cedric@debian:~$ ./a.out
+Enter a value:41
+Inc: 42
+</code>
+==== Equivalent in python ====
+<code python>
+>>> def inc():
+...     value = raw_input("Enter a value:")
+...     print "Inc:", int(value)+1
+...
+>>> inc()
+Enter a value:41
+Inc: 42
 </code>
@@ Line 35: / Line 71: @@
 ===== Read a file =====
 <code c>
-#include <iostream.h>
+#include <stdio.h>   /* required for file operations */
-#include <fstream.h>
-int main ()
+FILE *fr;            /* declare the file pointer */
+main()
 {
-        //  Open the file
+   char line[1024];
-        ofstream inputFile ("./file.txt", ios::in);
+   fr = fopen ("./file.txt", "rt");  /* open the file for reading */
-        // Test
+   /* "rt" means open the file for reading text */
-        if (!inputFile)
-        {
+   while(fgets(line, 1024, fr) != NULL)
-                cerr << "Error" << endl;
+   {
-                exit (1);
+         printf ("%s\n", line);
-        }
+   }
-        char buf [1024];
+   fclose(fr);  /* close the file prior to exiting the routine */
-        //  Until there are no more lines in the file,
-        //  read and display it.
-        while (!inputFile.eof())
-        {
-                inputFile.getline (buf,1024);;
-                cout << buf << endl;;
-        }
-        // Close the file
-        inputFile.close ();;
 }
 </code>
-===== Equivalent in python =====
+==== Equivalent in python ====
 <code python>
 for line in open("./file.txt", "r"):
     print line
 </code>