Here’s the C program, I use Visual Studio Community 2022 with MSVC compiler. What are all those mov instructions, I don’t use any compiler optimization flags.

#include <stdio.h>
int main(void) {
    int a = 11;
    int b = 13;
    a += b;
    a += 15;
    a += 17;
    a += 23;
    return 0;
}

Here’s the disassembly view of the running program.

    int a = 11;
00007FF75AB9175D  mov         dword ptr [a],0Bh  
    int b = 13;
00007FF75AB91764  mov         dword ptr [b],0Dh  
    a += b;
00007FF75AB9176B  mov         eax,dword ptr [b]  
00007FF75AB9176E  mov         ecx,dword ptr [a]  
00007FF75AB91771  add         ecx,eax  
00007FF75AB91773  mov         eax,ecx  
00007FF75AB91775  mov         dword ptr [a],eax  
    a += 15;
00007FF75AB91778  mov         eax,dword ptr [a]  
00007FF75AB9177B  add         eax,0Fh  
00007FF75AB9177E  mov         dword ptr [a],eax  
    a += 17;
00007FF75AB91781  mov         eax,dword ptr [a]  
00007FF75AB91784  add         eax,11h  
00007FF75AB91787  mov         dword ptr [a],eax  
    a += 23;
00007FF75AB9178A  mov         eax,dword ptr [a]  
00007FF75AB9178D  add         eax,17h  
00007FF75AB91790  mov         dword ptr [a],eax