CSE240 Lecture 07

Introduction to Programming Languages
Data types in C
(202009)

Transcript

1. jgs
   CSE 240
   Introduction to Programming Languages
   Lecture 07: Data types in C
   Dr. Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu | javiergs.com
   PERALTA 230U
   Office Hours: By appointment
   

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2. jgs
   Previously …
   

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3. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 3
   jgs
   Output
   printf (control sequence, expressions);
   • The control sequence includes a
   constant string to be printed, e.g.,
   "Result: ", and control symbols to be
   used to convert variables from their
   numeric values that are stored in the
   computer to printing format.
   • The expressions is the list of
   expressions whose values are to be
   printed out. Each expression is
   separated by a comma. This is
   optional.
   // Java
   int x = 5;
   float y = 10.3f;
   System.out.println("hello " + x + " bye " + y);
   // C
   int x = 5;
   float y = 10.3;
   printf("hello %d bye %f", x, y);
   

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4. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 4
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   #include
   void main () {
   int i, n = 5;
   printf("Hi, please enter an integer: ");
   // input: scanf (control sequence, &variable1, ... &variablen);
   // &variable: address of the variable.
   scanf("%d", &i); // input function
   if (i > n)
   n = n + i;
   else
   n = n - i;
   printf("i = %d, n = %d\n", i, n); //output function
   }
   Input
   

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5. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 5
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   Control Statements
   These that you know, work in the same way
   § for, while, do/while
   § if/else, switch
   But, there are not boolean values. Zero is false and any other number is true.
   The following program is correct and print “Hello”
   

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6. jgs
   Primitive Data Types
   

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7. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 7
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   Primitive Data Types and Modifiers
   C defines five basic types
   § int - integer, a whole number.
   § float - floating point value i.e., a number with a fractional part.
   § double - a double-precision floating point value.
   § char - a single character.
   § void - valueless special purpose type which we will examine closely in later
   sections.
   C++ will add
   • bool – boolean values
   Primitive types can be modified using one or more of these modifiers
   § signed,
   § unsigned,
   § short,
   § long
   

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8. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 8
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   Type Guaranteed minimum range ³ bits
   char -127 to 127 or 0 to 255 8
   signed char -127 to 127 8
   unsigned char 0 to 255 8
   int -32,768 to 32,767 16,32
   signed int same as int 16,32
   unsigned int 0 to 65,535 16,32
   short int -32,768 to 32,767 16
   signed short int same as short int 16
   unsigned short int unsigned int 16
   long int ±2,147,483,647 32
   signed long int same as long int 32
   unsigned long int 0 to 4,294,967,295 32
   float 6 decimal digits of precision 32
   double 10 decimal digits of precision 64
   long double 10 decimal digits of precision 64
   bool (C++ only) true/false 1 (8)
   Basic Data Types and Ranges in C
   

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9. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 9
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   Type Guaranteed minimum range ³ bits
   char -127 to 127 or 0 to 255 8
   signed char -127 to 127 8
   unsigned char 0 to 255 8
   int -32,768 to 32,767 16,32
   signed int same as int 16,32
   unsigned int 0 to 65,535 16,32
   short int -32,768 to 32,767 16
   signed short int same as short int 16
   unsigned short int unsigned int 16
   long int ±2,147,483,647 32
   signed long int same as long int 32
   unsigned long int 0 to 4,294,967,295 32
   float 6 decimal digits of precision 32
   double 10 decimal digits of precision 64
   long double 10 decimal digits of precision 64
   bool (C++ only) true/false 1 (8)
   Basic Data Types and Ranges in C
   

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10. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 10
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    Basic Data Types and Ranges in C
    Type Guaranteed minimum range ³ bits
    char -127 to 127 or 0 to 255 8
    signed char -127 to 127 8
    unsigned char 0 to 255 8
    int -32,768 to 32,767 16
    signed int same as int 16
    unsigned int 0 to 65,535 16
    short int -32,768 to 32,767 16
    signed short int same as short int 16
    unsigned short int unsigned int 16
    long int ±2,147,483,647 32
    signed long int same as long int 32
    unsigned long int 0 to 4,294,967,295 32
    float 6 decimal digits of precision 32
    double 10 decimal digits of precision 64
    long double 10 decimal digits of precision 64
    bool (C++ only) true/false 1 (8)
    unsigned int x = 65000;
    int x = 32767;
    

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11. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 11
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    Type Guaranteed minimum range ³ bits
    char -127 to 127 or 0 to 255 8
    signed char -127 to 127 8
    unsigned char 0 to 255 8
    int -32,768 to 32,767 16
    signed int same as int 16
    unsigned int 0 to 65,535 16
    short int -32,768 to 32,767 16
    signed short int same as short int 16
    unsigned short int unsigned int 16
    long int ±2,147,483,647 32
    signed long int same as long int 32
    unsigned long int 0 to 4,294,967,295 32
    float 6 decimal digits of precision 32
    double 10 decimal digits of precision 64
    long double 10 decimal digits of precision 64
    bool (C++ only) true/false 1 (8)
    Basic Data Types and Ranges in C
    

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12. Javier Gonzalez-Sanchez | CSE240 | Spring 2018 | 12
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    Questions
    

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13. jgs
    CSE 240 Introduction to Programming Languages
    Javier Gonzalez-Sanchez, Ph.D.
    javiergs@asu.edu
    Fall 2021
    Copyright. These slides can only be used as study material for the class CSE240 at Arizona State University.
    They cannot be distributed or used for another purpose.
    

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