Nano C - C language interpreter

Download on AppStore.

Turn your mobile device into a real computer

What makes a computer a computer? Actually, it follows from its name, derived from the word compute - compute. Yes, he has to calculate. But not as a calculator or even a programmable calculator. Computer must give us the opportunity to program complex calculation algorithms, enter the source data and get results not only in the form of numbers, but also texts, charts and graphs.

Nano Cis a C language interpreter for the iPhone and iPad. Nano C allows arbitrary calculations on your mobile device and display the results in text and graphical representation.

Program and its results can be sent to email. Wildcards are supported for fast input of language constructs.

This version has the following elements of the C language:

• Operator if – else
• Operator switch
• Looping operators for, while, do - while. Supported break and continue.
• Variables int, float, char.
• Arrays of types int, float, and char.
• Functions of types void, int, float and char. Operator return.
• Mathematical Functions abs, acos, asin, atan, ceil, cos, random, exp, fabs, floor, log, log10, rint, sin, sinh, sqrt, tan, tanh, atan2, fmod, pow.
• Text output functions printf, print.
• Console input function get.
• Specific functions of graphical output moveto, line, circle, pixel, setcolor, setwidth.
• Specific charting functions linechart, barchart, piechart.
• Function sizeof.
• Functions chr, ord, strcmp, strlen, strchr, strstr, strlwr, strupr, substr, str_replace.
• Operators +, -, *, /, %, <, >, <=, >=, ==, !=, ++, --, +=, -=, /=, *=, %=.

Examples of C programs

float gl_a, gl_b; // Global variables
int main()
{
   // Local variables
   int x = 5, y = 6, z;
   char c = 'Some text';
   gl_a = 8.25;
   z = x * y + 3 - gl_a;
   if(z > 10) print('text 1'); else print('text 2');
   print('Hello, World! ' + z);
}

void main()
{
   char str1 = "Hello";
   char str2 = "World";
   char str3;
   int  len;

   // copy str1 into str3
   str3 = str1;
   printf("strcmp(str1, str3) :  %d\n", strcmp(str1, str3));
   printf("strcmp(str1, str2) :  %d\n", strcmp(str1, str2));

   // concatenates str1 and str2
   str1 = str1 + str2;
   printf("strcat(str1, str2):   %s\n", str1);

   // total lenghth of str1 after concatenation
   len = strlen(str1);
   printf("strlen(str1) :  %d\n", len);

   // Find character in string
   printf("strchr(str1, 'y'):   %d\n", strchr(str1, 'y'));
   printf("strchr(str1, 'W'):   %d\n", strchr(str1, 'W'));

   // Find string in string
   printf("strstr(str1, 'lli'):   %d\n", strstr(str1, 'lli'));
   printf("strstr(str1, 'llo'):   %d\n", strstr(str1, 'llo'));

   // Convert string to lowercase
   printf("strlwr(str3):   %s\n", strlwr(str3));

   // Convert string to uppercase
   printf("strupr(str3):   %s\n", strupr(str3));

   // Substring of a string
   printf("substr(str1, 2, 5):   %s\n", substr(str1, 2, 5));


   // Replace all occurrences of substring
   // str_replace (string, substr, replacement)
   printf("str_replace (str1, 'o', 'a'):   %s\n", str_replace (str1, 'o', 'a'));

}

int main()
{
   // Arrays without data
    int ar[];\n
   // An array with data
   char ch[] = {'one', 'two', 'three'};
   // Array size of 100 cells
   float f[100] = {1.5, 2.2, 3};\n
   // Add data to array
   for(int i = 0; i < 5; i++)
   {
       ar[] = i * 10;
   }\n
   print('Data from array ar');
   // Print data from an array
   for(i = 0; i < sizeof(ar); i++)
   {
       print(ar[i]);
   }\n
   // For loop
   print('');
   print('for');
   for(int j = 0; j < sizeof(ch); j++) { print(ch[j]); }
   // do-while loop
   print('');
   print('do - while');
   i = 0;
   do
   {
       print( ++i * 5);
   } while(i < 5)\n
   // while loop
   print('');
   print('while');
   int x = 5;
   while(x > 0)
   {
       print(x--);
   }
}

int main()
{
   int number = get('Enter a number');
   int fact = 1;
   printf('%d! = %d', number, factorial(number));
}
int factorial(int n)
{
   int result = 1;
   for (int c = 1; c <= n; c++)
   {
       result = result * c;
   }
   return result;
}

Screenshots

Limitations of Nano C

• Blocks of cycle operators should always be enclosed in braces.
• Limited library of standard functions, which will be expanded in future releases of the program.

Description of built-in features of Nano C.

• Print – Outputs the text information to the screen. Always prints a new line.
  Format print(, , ….);
  Examples
  Print(‘Hello, World!’);
  Int x = 10;
  char name = “John”;
  print(“Hi, ”, name, “. You get ”, x * 2 + 3);
• Printf – Outputs formatted text information to the screen
  Format printf(<String with format>, <Value of placeholder 1>, <Value of placeholder 2>…);
  Examples
  Printf(‘Hello, World!’);
  Int x = 10;
  char name = “John”;
  printf(“Hi, %s . You get %d”, name, x * 2 + 3);
  Types of supported placeholders %s – string, %d – integer, %f – float.
• get – Console input function.
  Format get(<Message>);
  Example
  char name = get('What is your name?');
  print(“Hi, ”, name);
  
  char c;
  while((c = get("Enter your name")) != '')
  {
  printf("Hi, %s\n",c);
  }
• Sizeof – Size of the variable.
  Calculates the length of the string or the number of elements in the array.
• Moveto – Move to the specified coordinates.
  Format moveto(<X>, <Y>);
• Line (Addline) – Draw a line from the current position to the specified coordinates.
  Format line(<X>, <Y>);
• Circle – Draw a circle
  Format circle(<X>, <Y>, <Radius>);
• Pixel – Draw a point
  Format pixel(<X>, <Y>);
• Setcolor – set the line color
  Format setcolor(<R>, <G>, <B>); // RGB 0...255
• Setwidth – set line thickness
  Format setwidth(<Line thickness>);
• linechart – Draw a line chart
  Format linechart(<an array of values>, <an array of names>);
  Example
  
  float vals[] = {-10,-24,14};
  char labels[] = {'January', 'February', 'March'};
  linechart(vals, labels);\n"
  
  Example of multi line chart
  float vals[];
  vals[] = {-10,-24,14,18,28};
  vals[] = {10,24,20,18,16};
  vals[] = {20,30,25};
  char labels[] = {'January', 'February', 'March', 'April', 'May'};
  linechart(vals, labels);
  
• barchart – Draw a bar chart
  Format barchart(<an array of values>, <an array of names>);
  Example
  
  float vals[] = {-10,-24,14};
  char labels[] = {'January', 'February', 'March'};
  barchart(vals, labels);\n"
  
  Example of multi bar chart
  float vals[];
  vals[] = {-10,-24,14,18,28};
  vals[] = {10,24,20,18,16};
  vals[] = {20,30,25};
  
  barchart(vals, labels);
  
• piechart – Draw a pie chart
  Format piechart(<an array of values>, <an array of names>);
  Example
  
  float vals[] = {10,24,14,18,28,40,30,20,15,16,8,4,3,1};
  char labels[] = {'January', 'February', 'March', 'April', 'May'};
  piechart(vals, labels);\n"