Diff: main.cpp

Revision:

0:5cab3f40a061

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 25 11:40:11 2017 +0000
@@ -0,0 +1,46 @@
+/*
+    Project: StringTests
+    File: main.cpp
+    Modified and Ported to mbed/Nucleo by: Dr. C. S. Tritt
+    Last revised: 10/22/17 (v. 1.0)
+
+    Based on Program 6.2 Lengths of strings - from Beginning C, 5th ed. Ivor
+    Horton.
+
+*/
+#include "mbed.h"
+#include "string.h"
+
+int main(void)
+{
+    // Check for C11 library extensions. It appears that the mbed online 
+    // compiler does not support the library extensions.
+    #if defined __STDC_LIB_EXT1__
+        printf("\nOptional functions are defined.\n\n");
+    #else
+        printf("\nOptional functions are not defined.\n\n");
+    #endif
+    
+    // Declare and define strings and count variable.
+    char str1[] = "2B or not 2B";
+    char str2[] = ",that is not the \0question."; // Manual null insertion!
+    unsigned int count; // Used to store the string lengths.
+
+    // Determine "size" three ways.
+    printf("Size of the string \"%s\" is %d characters.\n", str1, sizeof(str1));
+    printf("Length of the string \"%s\" is %d characters.\n", 
+        str1, strlen(str1)); // Danger, not a safe C function.
+    for (count = 0; count < sizeof(str1); count++) { // Safely count chars.
+        if (str1[count] == '\0') break; // Stop at null char. 
+    }
+    printf("Count of the string \"%s\" is %d characters.\n\n", str1, count);
+    
+    // Repeat for other string.
+    printf("Size of the string \"%s\" is %d characters.\n", str2, sizeof(str2));
+    printf("Length of the string \"%s\" is %d characters.\n", 
+        str2, strlen(str2)); // Danger, not a safe C function.
+    for (count = 0; count < sizeof(str2); count++) { // Safely count chars.
+        if (str2[count] == '\0') break; // Stop at null char. 
+    }
+    printf("Count of the string \"%s\" is %d characters.\n", str2, count);
+}
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