Input-Output Techniques: In all programming competition, or more specially, in all useful program, you require to read in input and process it. Though, the input data can be as horrible as possible, and this can be very troublesome to the parse.
If you spend too much time in the coding how to parse the input proficiently and you are utilizing C/C++ as your programming language, then this tip is especially for you. Let us see an illustration:
How to read the following input: 1 2 2 3 1 2 3 1 2 The fastest method to do it is:
#include <stdio.h> int N; void main() { while(scanf("%d",&N==1)){ process N… } }
There are N lines; each line always begins with character '0' followed by '.', then unknown number of digits x, lastly the line always terminated by three dots "...".
N 0.xxxx...
The fastest method to do it is:
#include <stdio.h> char digits[100]; void main() { scanf("%d",&N); for (i=0; i<N; i++) { scanf("0.%[0-9]...",&digits); // surprised? printf("the digits are 0.%s\n",digits); } }
This is the trick which many C/C++ programmers do not aware of. Why we state C++ while scanf/printf is a standard C I/O routine? This is since most of the C++ programmers "forcing" themselves to employ cin/cout all the time, devoid of realizing that scanf/printf can still be employed within all C++ programs. Advanced use of printf() and scanf():
Such who have forgotten the advanced use of printf() and scanf(), remind the following illustrations:
scanf("%[ABCDEFGHIJKLMNOPQRSTUVWXYZ]",&line); //line is a string
This scanf() function takes just upper-case letters as input to line and any other characters other than A….Z terminates the string. Likewise the following scanf() will behave like gets():
scanf("%[^\n]",line); //line is a string
Learn the default terminating characters for the scanf(). Using new line with scanf():
When the content of a file (input.txt) is
abc def
And the following program is performed to take input from file:
char input[100],ch; void main(void) { freopen("input.txt","rb",stdin); scanf("%s",&input); scanf("%c",&ch); }The following is a small modification to code: char input[100],ch; void main(void) { freopen("input.txt","rb",stdin); scanf("%s\n",&input); scanf("%c",&ch); }
What will be their respective value? The value of ch will be '\n' for the first code and 'd' for second code.Be careful about using gets() and scanf() together:
You must as well be careful about using gets() and scanf() in similar program. Test it with the following scenario. Code is as shown below:
scanf("%s\n",&dummy); gets(name); And the input file is: ABCDEF bbbbbXXX
What do you obtain as the value of name? "XXX" or "bbbbbXXX" (Here, ‘b’ signifies blank or space)
Latest technology based Programming Languages Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Programming Languages help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Programming Languages, project ideas and tutorials. We provide email based Programming Languages help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Programming Languages. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Programming Languages Homework help and assignment help services. They use their experience, as they have solved thousands of the Programming Languages assignments, which may help you to solve your complex issues of Programming Languages. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
tutorsglobe.com phytochromes and flowering assignment help-homework help by online photoperiodism tutors
tutorsglobe.com effects on distribution assignment help-homework help by online effects of changes in prices tutors
tutorsglobe.com metabolism of proteins assignment help-homework help by online protein metabolism tutors
Natural Dyes-Dyeing Processes tutorial all along with the key concepts of Definition of Natural Dyes and Mordant, Types of Natural Dyes, Natural Dyes Obtained from Plants, Natural Dyes Obtained from Animals, Categories of Natural Dyes, Natural dyeing, Mordants for Natural Dyeing
theory and lecture notes of context free grammars & languages all along with the key concepts of context free grammars & languages (cfg, cfl), example of recursive data structures, symmetric structures, ambiguous structures. tutorsglobe offers homework help, assignment help and tutor’s assistance on context free grammars & languages.
www.tutorsglobe.com offers aldehydes and ketones homework help, aldehydes and ketones assignment help, online tutoring assistance, organic chemistry solutions by online qualified tutor's help.
Phylum Aschelminthes tutorial all along with the key concepts of Features of Aschelminthes, Classification of Aschelminthes, Feature of Ascaris Lumbricoides, Structural Adaptation of Ascan Lumbricoides
tutorsglobe.com buds assignment help-homework help by online shoot system tutors
tutorsglobe.com classification of bacteria assignment help-homework help by online bacteria tutors
a good insulating material has to possess the following characteristics - extremely high insulation resistance, high dielectric strength, low thermal expansion.
tutorsglobe.com introduction of foreign gene assignment help-homework help by online recombinant dna technology tutors
Physical methods of controlling Microbial growth tutorial all along with the key concepts of Definition of Sterilization, Pattern of Microbial Death, Heat Sterilization, Moist Heat Sterilization, The Autoclave and Dry Heat Sterilization
tutorsglobe.com vsb transmission assignment help-homework help by online characteristics of camera tubes tutors
Phyla Mollusca and Echinodermata tutorial all along with the key concepts of Features of Phyla Mollusca and Echinodermata, Adaptations and Development, Classification of mollucs, Features of Echinoderms and Symmetries of Echinoderms
tutorsglobe.com reactions of electron transport assignment help-homework help by online electron transport chain tutors
1957228
Questions Asked
3689
Tutors
1455283
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!