String class not recognized in S-function
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I want to use an S-function in my simulink model to convert a constant integer to a string, using ASCII code also. The digits of the number will be assigned in the following way: (0-> 'A',...,9->'J') Ex.
input 123 -> S-function -> output 'BCD'. Basically, i would like the same thing as him http://www.mathworks.com/matlabcentral/answers/1804-ascii-string-with-sci-transmit
I'm using S-function builder. The code below is put in the Output pane
typedef unsigned char byte;
byte i,nr;
byte v[10];
char w[10];
char s; //sign of the input number
string Convert(u[0]); //the function which does the conversion
{
long newu = 0;
nr = 0;
s = 0;
if(u[0]<0)
s = 1;
while(u[0]!=0)
{
newu = newu * 10 + (u[0] % 10);
u[0]/=10;
nr++;
}
for(i=nr;i>=1;i--)
{
v[i]=newu %10;
newu/=10;
}
for(i=1;i<=nr;i++)
{
switch(v[i])
{
case 0: w[i]='A';
break;
case 1: w[i]='B';
break;
case 2: w[i]='C';
break;
case 3: w[i]='D';
break;
case 4: w[i]='E';
break;
case 5: w[i]='F';
break;
case 6: w[i]='G';
break;
case 7: w[i]='H';
break;
case 8: w[i]='I';
break;
case 9: w[i]='J';
break;
}
}
string Convert[0](w); // converts char array(w) into a string
return(Convert[0]);
}
In the Library pane, i include the following:
#include <string.h>, but after build, i get ''undeclared identifier `string'''
I don't know about the errors in the code(i'm sure there are many, because i have little c knowledge)
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Réponse acceptée
Walter Roberson
le 9 Jan 2013
The only type that <string.h> defines is size_t . See http://pubs.opengroup.org/onlinepubs/7908799/xsh/string.h.html
You might perhaps be thinking of C++'s <string;> . See http://www.cplusplus.com/reference/string/ but remember that is for C++ not for C.
4 commentaires
Walter Roberson
le 10 Jan 2013
If you use a .c extension then that would be for C language code, which does not define "string" as a datatype.
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