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How can I change a character inside a string?

jnxmm (2)
Hello! How can I change a character inside a string? For example,

cout<<"sin(a): "<<sin(a);

The "a" in sin(a) needs to be changed into the number inputted by the user.

Thank you in advance!
lastchance (6980)
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#include <iostream>
#include <cmath>
using namespace std;

int main()
{
   double a;
   cout << "Enter an angle (in radians): ";   cin >> a;
   cout << "sin(" << a << ")=" << sin(a) << '\n';
}
 
Enter an angle (in radians): 0.5236
sin(0.5236)=0.500001
jnxmm (2)
Thank you so much!
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