This is my calculator in C++ with in-line assembler:
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#include <iostream> #include <stdio.h> #include <string> using namespace std; int main( void ) { int nZahl1 = 0, nZahl2 = 0, nVar3 = 0;string strOp=""; do{ cout << "calculate (+,-,*,/) :" ; cin >> strOp; cout << "number 1: " ; cin >> nZahl1; cout << "number 2: " ; cin >> nZahl2; if("+"==strOp){ asm("ADD %%edx, %%eax \n":"=a"(nZahl1):"d"(nZahl2),"a"(nZahl1)); cout <<" = "<<(nZahl1)<<endl; }else if("-"==strOp){ asm("SUB %%edx, %%eax \n":"=a"(nZahl1):"d"(nZahl2),"a"(nZahl1)); cout <<" = "<<(nZahl1)<<endl; }else if("*"==strOp){ asm("MOV %%edx, %%eax \n":"=a"(nVar3):"d"(nZahl1),"a"(nVar3)); for(int i = 2 ;i<=nZahl2;i++) asm("ADD %%edx, %%eax \n":"=a"(nZahl1):"d"(nVar3),"a"(nZahl1)); cout <<" = "<<(nZahl1)<<endl; }else if("/"==strOp){ asm("MOV %%edx, %%eax \n XOR %%edx,%%edx \n":"=a"(nVar3),"=d"(nZahl1):"d"(nZahl1),"a"(nVar3)); for(int i = nZahl2 ;nVar3>=i;nZahl1++) asm("SUB %%edx, %%eax \n":"=a"(nVar3):"d"(nZahl2),"a"(nVar3)); cout <<" = "<<(nZahl1)<<","; for(int i = 0 ;i<=10;i++){ nVar3*=10;nZahl1=0; for(int i = nZahl2 ;nVar3>=i;nZahl1++) asm("SUB %%edx, %%eax \n":"=a"(nVar3):"d"(nZahl2),"a"(nVar3)); cout <<(nZahl1); } cout << endl; } }while(1); return(0); } |
Compile the code:
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g++ -o main test.cpp ./main |
output:
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calculate (+,-,*,/) :+ number 1: 4 number 2: 5 = 9 calculate (+,-,*,/) :- number 1: 9 number 2: 4 = 5 calculate (+,-,*,/) :^C sh-4.3# main calculate (+,-,*,/) :+ number 1: 4 number 2: 5 = 9 calculate (+,-,*,/) :- number 1: 9 number 2: 4 = 5 calculate (+,-,*,/) :* number 1: 4 number 2: 5 = 20 calculate (+,-,*,/) :/ number 1: 20 number 2: 4 = 5,00000000000 |
Piece of writing writing is also a fun, if you know after that you
can write or else it is difficult to write.