Let Us C / Chapter 11 (Console Input Output)

                                 Exercise [D]

(a) 

Write down two functions xgets( ) and xputs( ) which work similar to the standard library functions gets( ) and puts( ).

Solution:

#include<stdio.h>
#include<conio.h>

void xgets();
void xputs();

void main() {

char str[80];
clrscr();

xgets(str);

printf("\n");

xputs(str);

getch();

}

void xgets( char *s) {

int i=0;
char ch;


for(i=0;i<=79;i++) {

ch=getche();

if(ch=='\r') {

*s='\0';
break;
}

if(ch=='\b') {

printf("\b");

i-=2;
s-=2;
}

else {

*s=ch;
s++;

}

 }

}

void xputs( char *s) {

while(*s!='\0') {

putch(*s);

s++;

}


}

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(b) Write down a function getint( ), which would receive a numeric string from the keyboard, convert it to an integer number and return the integer to the calling function. A sample usage of getint( ) is shown below:

main( )

{

int a ;

a = getint( ) ;

printf ( "you entered %d", a )

}

Solution:

#include<stdio.h>

#include<conio.h>

void main() {

int a;

char s[80];

printf("Enter any numeric string: ");

gets(s);

a=getint(s);     /* converting and receiving string as integer */

printf("\n\nYou entered = %d\n",a);

getch();

}

int getint(char s1[80]) {

int digit;

digit=atoi(s1);   /* converting string to integer */

return digit;

}

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