# The command "cout" does not output the result

**URL:** <https://community.freefem.org/t/the-command-cout-does-not-output-the-result/1759>\
**Category:** General Discussion\
**Created:** [May 20, 2022, 10:41am UTC](https://community.freefem.org/t/the-command-cout-does-not-output-the-result/1759 "2022-05-20T10:41:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Qianrui](https://avatars.discourse-cdn.com/v4/letter/q/9fc348/32.png) [@Qianrui](https://community.freefem.org/u/Qianrui)\
**Post date:** [May 20, 2022, 10:41am UTC](https://community.freefem.org/t/the-command-cout-does-not-output-the-result/1759/1 "2022-05-20T10:41:03Z")

</div>

Use this command

> C:\Users\DELL\>FreeFem+±mpi 05.15学习程序书.edp

to run the following program,

> load “MPICG”  
> load “medit”  
> load “metis”  
> include “getARGV.idp”  
> include “MPIplot.idp”  
> include “MPIGMRESmacro.idp”
> 
> searchMethod = 0;  
> assert(version \>= 3.11);  
> real[int] ttt(10);  
> int ittt=0;  
> macro settt {ttt[ittt++] = mpiWtime();}//  
> verbosity=getARGV(“-vv”,0);  
> int vdebug=getARGV(“-d”,1);  
> int ksplit=getARGV(“-k”,10);  
> int nloc = getARGV(“-n”,25);  
> string sff=getARGV(“-p,”,“”);  
> int gmres=getARGV(“-gmres”,3);  
> bool dplot=getARGV(“-dp”,0);  
> int nC = getARGV(“-N” ,max(nloc/10,4));
> 
> if (mpirank==0 && verbosity){  
> cout \<\< "ARGV: ";  
> for (int i = 0; i \< ARGV.n; ++i)  
> cout \<\< ARGV[i] \<\< " ";  
> cout \<\< endl;  
> }
> 
> if(mpirank==0 && verbosity)  
> cout \<\< " vdebug: " \<\< vdebug \<\< ", kspilt "\<\< ksplit \<\< ", nloc "\<\< nloc \<\< ", sff "\<\<sff \<\< “.” \<\< endl;

but “cout” does not output the result. Why?

> C:\Users\DELL\>FreeFem+±mpi 05.20xuexi.edp  
> – FreeFem++ v4.1 (Sat, Nov 13, 2021 7:40:01 PM - git v4.10)  
> file : 05.20xuexi.edp  
> Load: lg\_fem lg\_mesh lg\_mesh3 eigenvalue parallelempi  
> 1 : load “MPICG”(load: loadLibary E:\FreeFem++\.\MPICG = 0)  
> 2 : load “medit”(load: loadLibary E:\FreeFem++\.\medit = 0)  
> 3 : load “metis”(load: loadLibary E:\FreeFem++\.\metis = 0) load: init metis (v 5 )
> 
> ```
> 4 : include "getARGV.idp" // for gestion of FreeFem++ argument and in version 3.10-1 FH
> 2 : // F. Hecht
> 3 : // Usage: getARGV(n,defaultvalue) // get the fist used default valeu
> 4 : // or getARGV(after,defaultvalue) // get the arg after after
> 5 : // the type of delfaut value given the return type: int,double, string
> 6 : // Modif version 3.54-2 Jan 2018 (add ones include)
> 
> ```
> 
> 96 & ENDIFMACROtARGV(“-n”," xxx") \<\< endl;ng default)length-4 ) ii;.length-2 \<\< endl;  
> 8 @ macro getARGVidp 1 //  
> 9 @  
> 10 @  
> 11 @ func int usedARGV(int n)  
> 12 @ {  
> 13 @ int k=1,ii=1,kk=1,ret=-1;  
> 14 @ for(int i=1;i\<ARGV.n;++i)  
> 15 @ {  
> 16 @ // cout \<\<i\<\< " “\<\< ARGV[i] \<\< " " \<\<(ARGV[i]==”-v") \<\< " " \<\< kk \<\< “==”  
> 17 @ // \<\< n \<\< " " \<\< ARGV[i].rfind(“dp”) \<\< " " \<\<ARGV[i].length-2 \<\< endl;  
> 18 @  
> 19 @ if(ARGV[i]==“-v”) i++;  
> 20 @ else if(ARGV[i]==“-fglut”) i++;  
> 21 @ else if(ARGV[i]==“-ffg”) i++;  
> 22 @ else if(ARGV[i]==“-glut”) i++;  
> 23 @ else if(ARGV[i]==“-f”) i++;  
> 24 @ else if(ARGV[i]==“-nw”) ii;  
> 25 @ else if(ARGV[i]==“-wait”) ii;  
> 26 @ else if(ARGV[i]==“-ne”) ii;  
> 27 @ else if(ARGV[i]==“-cd”) ii;  
> 28 @ //else if(ARGV[i].rfind(“.edp”)==ARGV[i].length-4 ) ii;  
> 29 @ else if(i==1) ii;  
> 30 @ else if(kk++==n) {ret=i;}  
> 31 @ // else cout \<\< " +++ \n";  
> 32 @ }  
> 33 @ // cout \<\< ret \<\< endl;  
> 34 @ return ret;  
> 35 @ }  
> 36 @  
> 37 @ func int usedARGV(string after)  
> 38 @ {  
> 39 @ int ret=-1;  
> 40 @ for(int i=ARGV.n-1;i\>=0;–i)  
> 41 @ if(ARGV[i]==after) { ret=++i; break;}  
> 42 @ if(ARGV.n\<ret) ret=-1;  
> 43 @ return ret;  
> 44 @ }  
> 45 @  
> 46 @ func int getARGV(int n,int default)  
> 47 @ {  
> 48 @ int d=default;  
> 49 @ int k=usedARGV(n);  
> 50 @ if(k\>0) d=strtol(ARGV[k]);  
> 51 @ return d;  
> 52 @ }  
> 53 @ func real getARGV(int n,real default)  
> 54 @ {  
> 55 @ real d=default;  
> 56 @ int k=usedARGV(n);  
> 57 @ if(k\>0) d=strtod(ARGV[k]);  
> 58 @ return d;  
> 59 @ }  
> 60 @ func string getARGV(int n,string default)  
> 61 @ {  
> 62 @ string d=default;  
> 63 @ int k=usedARGV(n);  
> 64 @ if(k\>0) d=ARGV[k];  
> 65 @ return d;  
> 66 @ }  
> 67 @  
> 68 @ func int getARGV(string after,int default)  
> 69 @ {  
> 70 @ int d=default;  
> 71 @ int k=usedARGV(after);  
> 72 @ if(k\>0) d=strtol(ARGV[k]);  
> 73 @ return d;  
> 74 @ }  
> 75 @ func real getARGV(string after,real default)  
> 76 @ {  
> 77 @ real d=default;  
> 78 @ int k=usedARGV(after);  
> 79 @ if(k\>0) d=strtod(ARGV[k]);  
> 80 @ return d;  
> 81 @ }  
> 82 @ func string getARGV(string after,string default)  
> 83 @ {  
> 84 @ string d=default;  
> 85 @ int k=usedARGV(after);  
> 86 @ if(k\>0) d=ARGV[k];  
> 87 @ return d;  
> 88 @ }  
> 89 @  
> 90 @ /\*  
> 91 @ cout \<\< getARGV(1,100) \<\< endl;  
> 92 @ cout \<\< getARGV(2,200.) \<\< endl;  
> 93 @ cout \<\< getARGV(3,“300.000”) \<\< endl;  
> 94 @ cout \<\< getARGV(“-n”," xxx") \<\< endl;  
> 95 @ _/  
> 96 @  
> 31 # elseplot(uh,plotparm);y(rq1); )1[i-1]),uh[i][]);}u " \<\< u.n \<\< endl ;  
> 44 # ) //EOM …;r;CommWorld);u);  
> 45 :  
> 6 : include “MPIGMRESmacro.idp”// MPIGMRSmacro.idp file… version 0.  
> 2 : // include in MPIGMRES.edp file …  
> 3 : // Frederic Hecht 2010  
> 4 : // LGPL licence  
> 5 : // Author [Frederic.Hecht@upmc.fr](mailto:Frederic.Hecht@upmc.fr)  
> 6 : // -------------------------------  
> 7 :  
> 8 : // macro to def // send-recv message  
> 9 : // -----------------------------------  
> 10 :  
> 11 :  
> 12 : func real maxM(matrix & A)  
> 13 : {  
> 14 : int[int] I(1),J(1);  
> 15 : real[int] C(1);  
> 16 : [I,J,C] =A;  
> 17 : return C.max ;  
> 18 : }  
> 19 :  
> 20 :  
> 28 # ) //EOMU[j]=0;j];),aTh,U)  
> 29 :  
> 30 :  
> 50 # ) //EOM\<\< " ++ISendRecvAny wait: get " \<\< k \<\< endl;n \<\< endl;  
> 51 :  
> 52 :  
> 62 # ) // EOM essor(comm,jpart[j]) \>\> Ri[j];  
> 63 :  
> 64 :  
> 85 # cout \<\< rj \<\< " s ========= r " \<\< rn[j] \<\< " " \<\< ipart \<\< " ↔ " \<\< in[j] \<\< " " \<\< 89 # } ) //EOM assert(err==0);  
> 90 :  
> 91 :  
> 107 # ) // EOF int k= mpiWaitAny(rq);\> Ri[j][];_/Ri[j]);  
> 108 :  
> 109 :  
> 110 :  
> 7 :  
> 8 : searchMethod = 0;  
> 9 : assert(version \>= 3.11);  
> 10 : real[int] ttt(10);  
> 11 : int ittt=0;  
> 12 : macro settt {ttt[ittt++] = mpiWtime();}//  
> 13 : verbosity=getARGV(“-vv”,0);  
> 14 : int vdebug=getARGV(“-d”,1);  
> 15 : int ksplit=getARGV(“-k”,10);  
> 16 : int nloc = getARGV(“-n”,25);  
> 17 : string sff=getARGV(“-p,”,“”);  
> 18 : int gmres=getARGV(“-gmres”,3);  
> 19 : bool dplot=getARGV(“-dp”,0);  
> 20 : int nC = getARGV(“-N” ,max(nloc/10,4));  
> 21 :  
> 22 : if (mpirank==0 && verbosity){  
> 23 : cout \<\< "ARGV: ";  
> 24 : for (int i = 0; i \< ARGV.n; ++i)  
> 25 : cout \<\< ARGV[i] \<\< " ";  
> 26 : cout \<\< endl;  
> 27 : }  
> 28 :  
> 29 : if(mpirank==0 && verbosity)  
> 30 : cout \<\< " vdebug: " \<\< vdebug \<\< ", kspilt "\<\< ksplit \<\< ", nloc "\<\< nloc \<\< ", sff "\<\<sff \<\< “.” \<\< endl;  
> 31 : sizestack + 1024 =1532 ( 508 )

---

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**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\
**Post date:** [May 20, 2022, 1:46pm UTC](https://community.freefem.org/t/the-command-cout-does-not-output-the-result/1759/2 "2022-05-20T13:46:56Z")

</div>

Because your `verbosity` variable is set to 0. Please try to read your code before posting these questions.