Example 1: atoi # include <stdlib.h> //atoi's library # include <stdio.h> int main ( void ) { string input = "9" ; int output = atoi ( input ) ; printf ( "%i" , output ) ; //this will print out 9 as an int not a string } Example 2: atoi c # include <stdio.h> # include <stdlib.h> # include <string.h> //CONVERT STRING TO INT int main ( ) { int val ; char str [ 20 ] ; strcpy ( str , "98993489" ) ; val = atoi ( str ) ; printf ( "String value = %s, Int value = %d\n" , str , val ) ; strcpy ( str , "tutorialspoint.com" ) ; val = atoi ( str ) ; printf ( "String value = %s, Int value = %d\n" , str , val ) ; return ( 0 ) ; } Example 3: what is atoi in strinf The C library function int atoi ( const char * str ) converts the string argument str to an integer ( type int ) . Note : It is...