Differences

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--- cplusplus:c_examples [2016/04/21 23:31] – created mithat
+++ cplusplus:c_examples [2020/12/07 02:40] (current) – [C Examples] mithat
@@ Line 1: / Line 1: @@
 ====== C Examples ======
-from \\
+Mithat Konar \\
-**Differences Between C and C++** \\
+Derived from //**Differences Between C and C++**// by Robert Niemann \\
-by Robert Niemann (Century College) \\
+-05-03
-/22/2015
+===== Input/output =====
+  * [[http://www.cplusplus.com/reference/cstdio/printf/ | printf() reference]]
+  * [[http://www.cplusplus.com/reference/cstdio/scanf/ | scanf() reference]]
+<file c example00.c>
+/* Basic printf use. */
+#include <stdio.h>
+int main()
+{
+  int numSpoons = 5;
+  printf( "I have %d spoons.\n", numSpoons );
+  return 0;
+}
+</file>
 <file c example01.c>
+/* Basic scanf use. */
 #include <stdio.h>
 int main()
 {
-    int this_is_a_number;
+    int num;
     printf( "Please enter a number: " );
-    scanf( "%d", &this_is_a_number );
+    scanf( "%d", &num );
-    printf( "You entered %d", this_is_a_number );
+    printf( "You entered %d\n", num );
-    getchar();
     return 0;
 }
@@ Line 21: / Line 41: @@
 <file c example02.c>
+/* Common I/O format specifiers. */
 #include <stdio.h>
-main()
+int main()
 {
   int dec = 5;
@@ Line 31: / Line 52: @@
   printf("%d %s %f %c\n", dec, str, pi,  ch);
+  return 0;
 }
 </file>
 <file c example03.c>
+/* More I/O format specifiers. */
 #include <stdio.h>
-main()
+int main()
 {
     char ch;
@@ Line 43: / Line 67: @@
     double y;
-    printf("enter a character, an integer, and a double:\n");
+    printf("Enter a character, an integer, and a double:\n");
     scanf("%c %d %lf", &ch, &x, &y);
     printf("%c %d %lf\n", ch, x, y);
+    return 0;
 }
 </file>
+===== File access =====
+  * [[http://www.cplusplus.com/reference/cstdio/fopen/ | fopen() reference]]
 <file c example04.c>
@@ Line 58: / Line 88: @@
     int x;
-    ptr_file =fopen("output.txt", "w");
+    ptr_file = fopen("output.txt", "w");
     if (!ptr_file)
         return 1;
-    for (x=1; x<=10; x++)
+    for (x = 1; x <= 10; x++)
+    {
         fprintf(ptr_file,"%d\n", x);
+    }
     fclose(ptr_file);
@@ Line 79: / Line 111: @@
 {
     FILE *ptr_file;
-    char buf[1000];
+    char buf[1000];    /* can store strings up to 999 chars long */
-    ptr_file =fopen("input.txt","r");
+    ptr_file = fopen("input.txt","r");
     if (!ptr_file)
-            return 1;
+    {
+        return 1;
+    }
-    while (fgets(buf,1000, ptr_file)!=NULL)
+    while (fgets(buf,1000, ptr_file) != NULL)
-            printf("%s",buf);
+    {
+        printf("%s",buf);
+    }
     fclose(ptr_file);
     return 0;
 }
 </file>