关于int main(int argc, const char * argv[])的理解

命令行参数

前面一个是int值,理论上后面一个char型的指针数组,每个字符型的指针都存贮一个字符串

(很像shell命令,$# 输出所有命令行参数个数,不包括命令本身, $*,输出所有命令行参数)

argc 命令行执行时输入字符串的个数,argv输出字符串的内容(输入都默认字符串类型)

所以下面这个程序输入结果为 ./main 执行结果是,argc=1,argv[0]=./main

输入结果是./mian 1 2 3 4 5 执行结果是argc=6,argv[0]=./main argv[1]=1  argv[2]=2  argv[3]=3  argv[4]=4  argv[5]=5

其实int main,还有二维数组,

复制代码
#include<stdio.h>
int main(int argc,char *argv[],char **env[]){
    int i;
    int sum=0;
    printf("argc=%d\n",argc);
    for(i=0;i<argc;i++){
        printf("argv[%d]=%s\n",i,argv[i]);
        sum+=atoi(argv[i]);//把字符数字转换成整型数值
    }
    printf("%d\n",sum);
    i = 0;
    while(env[i] != NULL){
        printf("env[%d] = %s\n",i,env[i]);
        i++;
    }
    return 0;
}
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输出值为

复制代码
argc=6
argv[0]=./test
argv[1]=12
argv[2]=23
argv[3]=34
argv[4]=45
argv[5]=56
170
env[0] = SHELL=/bin/bash
env[1] = SESSION_MANAGER=local/gunan-virtual-machine:@/tmp/.ICE-unix/1962,unix/gunan-virtual-machine:/tmp/.ICE-unix/1962
env[2] = QT_ACCESSIBILITY=1
env[3] = COLORTERM=truecolor
env[4] = XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg
env[5] = SSH_AGENT_LAUNCHER=gnome-keyring
env[6] = XDG_MENU_PREFIX=gnome-
env[7] = TERM_PROGRAM_VERSION=1.78.1
env[8] = GNOME_DESKTOP_SESSION_ID=this-is-deprecated
env[9] = GTK_IM_MODULE=fcitx
env[10] = LANGUAGE=zh_CN:zh:en_US:en
env[11] = LC_ADDRESS=zh_CN.UTF-8
env[12] = GNOME_SHELL_SESSION_MODE=ubuntu
env[13] = LC_NAME=zh_CN.UTF-8
env[14] = SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
env[15] = XMODIFIERS=@im=fcitx
env[16] = DESKTOP_SESSION=ubuntu
env[17] = LC_MONETARY=zh_CN.UTF-8
env[18] = GTK_MODULES=gail:atk-bridge
env[19] = DBUS_STARTER_BUS_TYPE=session
env[20] = PWD=/home/gunan/桌面/2023/518
env[21] = XDG_SESSION_DESKTOP=ubuntu
env[22] = LOGNAME=gunan
env[23] = XDG_SESSION_TYPE=wayland
env[24] = SYSTEMD_EXEC_PID=1962
env[25] = XAUTHORITY=/run/user/1000/.mutter-Xwaylandauth.33XG51
env[26] = VSCODE_GIT_ASKPASS_NODE=/usr/share/code/code
env[27] = HOME=/home/gunan
env[28] = USERNAME=gunan
env[29] = IM_CONFIG_PHASE=1
env[30] = LC_PAPER=zh_CN.UTF-8
env[31] = LANG=zh_CN.UTF-8
env[32] = LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.webp=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36:
env[33] = XDG_CURRENT_DESKTOP=Unity
env[34] = VTE_VERSION=6800
env[35] = WAYLAND_DISPLAY=wayland-0
env[36] = GIT_ASKPASS=/usr/share/code/resources/app/extensions/git/dist/askpass.sh
env[37] = GNOME_TERMINAL_SCREEN=/org/gnome/Terminal/screen/4894515f_454b_44bb_9530_5882defa2c0d
env[38] = CHROME_DESKTOP=code-url-handler.desktop
env[39] = CLUTTER_IM_MODULE=fcitx
env[40] = VSCODE_GIT_ASKPASS_EXTRA_ARGS=--ms-enable-electron-run-as-node
env[41] = GNOME_SETUP_DISPLAY=:1
env[42] = LESSCLOSE=/usr/bin/lesspipe %s %s
env[43] = XDG_SESSION_CLASS=user
env[44] = LC_IDENTIFICATION=zh_CN.UTF-8
env[45] = TERM=xterm-256color
env[46] = LESSOPEN=| /usr/bin/lesspipe %s
env[47] = USER=gunan
env[48] = VSCODE_GIT_IPC_HANDLE=/run/user/1000/vscode-git-c3dcbe394f.sock
env[49] = GNOME_TERMINAL_SERVICE=:1.140
env[50] = DISPLAY=:0
env[51] = SHLVL=2
env[52] = LC_TELEPHONE=zh_CN.UTF-8
env[53] = QT_IM_MODULE=fcitx
env[54] = LC_MEASUREMENT=zh_CN.UTF-8
env[55] = DBUS_STARTER_ADDRESS=unix:path=/run/user/1000/bus,guid=ea2b963d2a0d69846c9235f7646599aa
env[56] = XDG_RUNTIME_DIR=/run/user/1000
env[57] = LC_TIME=zh_CN.UTF-8
env[58] = VSCODE_GIT_ASKPASS_MAIN=/usr/share/code/resources/app/extensions/git/dist/askpass-main.js
env[59] = XDG_DATA_DIRS=/usr/share/ubuntu:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop
env[60] = GDK_BACKEND=x11
env[61] = PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin
env[62] = GDMSESSION=ubuntu
env[63] = ORIGINAL_XDG_CURRENT_DESKTOP=ubuntu:GNOME
env[64] = DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus,guid=ea2b963d2a0d69846c9235f7646599aa
env[65] = LC_NUMERIC=zh_CN.UTF-8
env[66] = TERM_PROGRAM=vscode
env[67] = _=./test
复制代码

 

posted @   风中凌乱的猪头  阅读(1032)  评论(1编辑  收藏  举报
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