'Argv 0' diaporamas de présentation

CS 201 Pointers and Arrays

CS 201 Pointers and Arrays. Every pointer has a type. Indicates what kind of thing the pointer points to You can cast pointers to be pointers to other types. This is powerful and also dangerous. Common example: return value of malloc. Every pointer has a value. Pointer value

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Introduction to Systems Software

Introduction to Systems Software. CSE 361S Fred Kuhns. Plan for Today. Exceptional Control Flow II Process hierarchy System startup Signals User-level ECF: Nonlocal jumps. ECF Exists at All Levels of a System. Exceptions Hardware and operating system kernel software

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Operating Systems Design (CS 423)

Operating Systems Design (CS 423). Elsa L Gunter 2112 SC, UIUC http://www.cs.illinois.edu/class/cs423/. Based on slides by Roy Campbell, Sam King, and Andrew S Tanenbaum. Unix System Calls. Process management: fork, exec, wait File handling open, read, write, close File namespace

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Homework

Homework. Continue with K&R Chapter 5 Skipping sections 5.7-5.9 for now Not covering section 5.12 Continue on HW5. Review Pointers. int a[ ] ={1,3,5,7,9,11,13,15,17,19}; int *pa = &a[4],*pb = &a[1]; What is the value of: *(a + 2)? Same as a[2]

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Perl

Perl. Day 1. Programming. Computers know how to execute a sequence of instructions Instructions must be very precise. Think of a recipe Preheat oven to 400F Place 1 cup sugar and 1 cup butter into a bowl Blend until creamy with a high speed mixer

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Homework

Homework. Continue with K&R Chapter 5 Skipping sections 5.7-5.9 for now Not covering section 5.12. Review Pointers. int a[ ] ={1,3,5,7,9,11,13,15,17,19}; int *pa = &a[4],*pb = &a[1]; What is the value of: *(a + 2)? Same as a[2] What is the value of: pa - pb? 3

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C For Java Programmers

C For Java Programmers. Tom Roeder CS415 2005sp. Why C?. The language of low-level systems programming Commonly used (legacy code) Trades off safety for speed Clear mapping from C statements to operations Simple to understand, imperative language Well-understood common optimizations.

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Chapter Nine

Chapter Nine. Perl and CGI Programming. Objectives. Basic features of Perl language Set up an HTML Web page Use Perl and CGI scripts to make your web pages interactive. Introduction to Perl. Perl is a script language Elements of csh, sh, awk Example: #! /usr/bin/perl

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Programming in C

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Using System Calls (Unix)

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Programming in C

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Programming in C

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Command Line arguments

Command Line arguments. Main function: int main(argc, char *argv[]) argc is the count of command line arguments argv is an array of strings argv[0] is the name of the program argv[1] is the first argument from the command line argv[k] is the k th argument from the command line

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LING 388: Language and Computers

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ECE 103 Engineering Programming Chapter 46 argc, argv, envp

ECE 103 Engineering Programming Chapter 46 argc, argv, envp. Herbert G. Mayer, PSU CS Status 6/4/2014 Initial content copied verbatim from ECE 103 material developed by Professor Phillip Wong @ PSU ECE. Syllabus. Command Line Arguments Examples. Accessing Command Line Arguments

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Variable Arguments in C

Variable Arguments in C. System Software Fall 2013. A short example. #include <stdio.h> #include <stdlib.h> /* for atoi() */ int main(int argc, char *argv[]) { int m,n; if (argc != 4) { printf("Usage: %s m n filename ",argv[0]);

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Command Line Arguments

Command Line Arguments. Dr. David A. Gaitros COP3330 Fall Term 2008. C/C++ Command Line Arguments. When executing a program in either C or C++ there is a way to pass command line arguments. Passed a character arrays. Each parameter separated by a space

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#include < stdio.h > int main( int argc , char * argv []) { int x, y, sum; if( argc != 3) {

a rgc , argv ? ????. #include < stdio.h > int main( int argc , char * argv []) { int x, y, sum; if( argc != 3) { fprintf ( stderr ,"Usage: %s no1 no2 ", argv [0]); exit(1); } x = atoi ( argv [1]); y = atoi ( argv [2]); sum = x+y ;

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(Dynamic linker variables)

0xbfffffff. Bottom of stack. Null-terminated environment variable strings. Null-terminated command-line arg strings. (Unused). envp[n] == NULL. envp[n-1]. environ. envp[0]. argv[argc] = NULL. argv[argc-1]. argv[0]. (Dynamic linker variables). envp. argv. argc. 0xbffffa7c.

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attachment

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