You can use the MATLAB editor to write C/C++ code. It is language sensitive.
You cannot use C/C++ (or .h) files directly from the command window. The C/C++ code must first be converted into a mex routine and compiled into a .mexw64 file, and then that file can be used from the command window (or from any m-code file). See this link to get started:
https://www.mathworks.com/help/matlab/call-mex-file-functions.html
Also, there are numerous mex routine example files in the FEX.
E.g., here is a simple mex routine that echos an input string to the screen:
/* File echo_string.c --> echos a string to the screen */
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
char *cp;
if( nlhs ) {
mexErrMsgTxt("This function does not produce any outputs.");
}
if( nrhs > 1 ) {
mexErrMsgTxt("Too many input arguments.");
} else if( nrhs == 1 ) {
if( mxIsChar(prhs[0]) ) {
cp = mxArrayToString(prhs[0]);
mexPrintf("%s\n",cp);
mxFree(cp);
} else {
mexErrMsgTxt("Input must be a char string.");
}
}
}
To compile and run it:
>> mex echo_string.c
>> echo_string
>> echo_string(4)
??? Error using ==> echo_string
Input must be a char string.
>> x = echo_string
??? Error using ==> echo_string
This function does not produce any outputs.
>> echo_string(2,3)
??? Error using ==> echo_string
Too many input arguments.
>> echo_string('this is a string')
this is a string
