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Functions Part 2-Introduction to Computer Programming-Lecture Slides, Slides of Computer Programming

Baddi University of Emerging Sciences and Technologies Computer Programming

Dr. Mehandi Nandakumar delivered this lecture at Baddi University of Emerging Sciences and Technologies for Introduction to Computer Programming course. Its main points are: Passing, Values, Functions, Pointers, Arrays, Strings, Returning, Pointers, Command, Line, Arguments

Typology: Slides

2011/2012

Uploaded on 07/13/2012

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Handout on Functions

Passing Values to Functions

#include <iostream.h>

int mult(int, int);

int main()

{int a = 10, b = 20;

cout << mult(a, b);

//cout << x << y;

// *** Error *** --unknown identifiers x, y

return 0;

}

int mult(int x, int y) // can have different names here

{return x*y;

}

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Discover Slides of Computer Programming Baddi University of Emerging Sciences and Technologies

Partial preview of the text

Download Functions Part 2-Introduction to Computer Programming-Lecture Slides and more Slides Computer Programming in PDF only on Docsity!

Handout on Functions

Passing Values to Functions #include <iostream.h>int mult(int, int);int main(){ int a = 10, b = 20;cout << mult(a, b);//cout << x << y;// * Error * --unknown identifiers x, yreturn 0;} int mult(int x, int y) //

can have different names here

{ return x*y;}

Handout on Functions

Passing Pointers to Functions #include <iostream.h>void f(int j);//or void f(int );int main(){ int i;int *p;p = &i; // p now points to if(p);cout << i;

// i is now 100

return 0;} void f(int j){ j = 100; // var pointed to by j is assigned 100}

Handout on Functions

Passing Arrays to Functions

#include <iostream.h>void display(int num[10]); //or display(int [10]);int main(){ int t[10],i;for(i=0; i<10; ++i) t[i]=i;display(t); // pass array t to a functioncout <<endl;for(i=0; i<10; i++) cout << t[i] << ' '; //output?} // Print some numbers.void display(int

num[10])

{ int i;for(i=0; i<10; i++) cout << num[i] << ' '; //output?for(i=0; i<10; i++) (num[i] = num[i] + 1);}

Handout on Functions

Passing Arraysto Functions

#include

<iostream.h> void^

cube(int

*n,^

int^ num);

int^ main(){ int

i,^ nums[10];for(i=0;

i<10;

i++)

nums[i]

=^ i+1;

cout^

<<^ "Original

contents:

for(i=0;

i<10;

i++)

cout

<<^ nums[i]

<<^ '

cout^

<<^ '\n'; cube(nums,

//^ compute

cubes

cout^

<<^ "Altered

contents:

for(i=0;

i<10;

i++)

cout

<<^ nums[i]

<<^ '

return

} void^

cube(int

*n,^

int^ num)

{ while(num){

*n^ =^

*n^ *^

*n;

num--;n++;} }

Original

contents:

Altered

contents:

Handout on Functions

ReturningPointers

#include <iostream.h>char get_substr(char sub, char str);int main(){ char substr;substr = get_substr("three", "one two three four");cout << "substring found: " << substr;return 0;}

char get_substr(char sub, char str){ int t;char p, p2, start;for(t=0; str[t]; t++){

p = &str[t]; // reset pointersstart = p;p2 = sub;while(p2 && p2==*p){ //check for substring

p++;p2++;

} /* If at end of p2 (i.e., substring),then a match has been found. /if(!p2)return start;/* return pointer to beginning ofsubstring */} return 0; // no match found

Handout on Functions

CommandLineArguments #include

<iostream.h> int^ main(int

argc,

char

*argv[])

{ if(argc!=2)

cout^

<<^ "You

forgot

to^ type

your

name.\n";

return

} cout^

<<^ "Hello

"^ <<

argv[1]

<<^ '\n';

return

#include <iostream.h>int main(int argc, char *argv[]){ int t, i;for(t=0; t<argc; ++t){// t denotes the t

th^ string

i = 0;while(argv[t][i]){// t[i] accesses the i

th^ character of t

cout << argv[t][i];++i;

cout << ' '; }

cout << ' '; } return 0;}

Handout on Functions

Passing Reference to Functions #include

<iostream.h> void

sqr_it(int

&x);

int^

main() { int

t^ =

10; cout

<<^

"Old

value

for

t:^

"^ <<

t^ <<

'\n';

sqr_it(t);

//^

pass

address

of^

t^ to

sqr_it()

cout

<<^

"New

value

for

t:^

"^ <<

t^ <<

'\n';

return

0; } void

sqr_it(int

&x)

{^ x

*=^

x;^ //

this

modifies

calling

argument

}

Handout on Functions

Returning References from Functions #include

<iostream.h> double

&f(); double

val

=^ 100.0; int^

main() { double

newval; cout

<<^

f()^

<<^ '\n';

//^

display

val's

value

newval

=^ f();

//^

assign

value

of^

val^

to^ newval

cout

<<^

newval

<<^

'\n';

//^

display

newval's

value

f()^

=^ 99.1;

//^

change

val's

value

cout

<<^

f()^

<<^ '\n';

//^

display

val's

new

value

return

0; } double

&f() {^ return

val;

//^

return

reference

to^

val

}

Functions Part 2-Introduction to Computer Programming-Lecture Slides, Slides of Computer Programming

Related documents

Partial preview of the text

Download Functions Part 2-Introduction to Computer Programming-Lecture Slides and more Slides Computer Programming in PDF only on Docsity!

Passing Values to Functions #include <iostream.h>int mult(int, int);int main(){ int a = 10, b = 20;cout << mult(a, b);//cout << x << y;// *** Error *** --unknown identifiers x, yreturn 0;} int mult(int x, int y) //

can have different names here

{ return x*y;}

Passing Pointers to Functions #include <iostream.h>void f(int *j);//or void f(int *);int main(){ int i;int *p;p = &i; // p now points to if(p);cout << i;

// i is now 100

return 0;} void f(int *j){ *j = 100; // var pointed to by j is assigned 100}

Passing Arrays to Functions

<<^ '

<<^ '

#include <iostream.h>char *get_substr(char *sub, char *str);int main(){ char *substr;substr = get_substr("three", "one two three four");cout << "substring found: " << substr;return 0;}

char *get_substr(char *sub, char *str){ int t;char *p, *p2, *start;for(t=0; str[t]; t++){

p = &str[t]; // reset pointersstart = p;p2 = sub;while(*p2 && p2==p){ //check for substring

p++;p2++;

} /* If at end of p2 (i.e., substring),then a match has been found. /if(!p2)return start;/* return pointer to beginning ofsubstring */} return 0; // no match found

"^ <<

Passing Reference to Functions #include

Passing Values to Functions #include <iostream.h>int mult(int, int);int main(){ int a = 10, b = 20;cout << mult(a, b);//cout << x << y;// * Error * --unknown identifiers x, yreturn 0;} int mult(int x, int y) //

Passing Pointers to Functions #include <iostream.h>void f(int j);//or void f(int );int main(){ int i;int *p;p = &i; // p now points to if(p);cout << i;

return 0;} void f(int j){ j = 100; // var pointed to by j is assigned 100}

#include <iostream.h>char get_substr(char sub, char str);int main(){ char substr;substr = get_substr("three", "one two three four");cout << "substring found: " << substr;return 0;}

char get_substr(char sub, char str){ int t;char p, p2, start;for(t=0; str[t]; t++){

p = &str[t]; // reset pointersstart = p;p2 = sub;while(p2 && p2==*p){ //check for substring