int main(int argc, char ** argv)
{
char op;
char mStr[1024];
matrix ans, m1, m2;
int sc = 0;
if(argc > 1){
op = getOp(argv[1]);
} else {
printf("Which operation: ");
op = getOp(NULL);
}
printf("First matrix:\n");
scanf("%s", mStr);
m1 = MatrixInit(mStr);
if(op == 'a' || op == 's' || op == 'm'){
printf("Second matrix:\n");
scanf("%s", mStr);
m2 = MatrixInit(mStr);
} else if(op == 'c') {
printf("Scalar multiple:\n");
scanf("%d", &sc);
}
switch(op){
case 'a':
ans = MatrixAdd(m1, m2);
break;
case 's':
ans = MatrixSub(m1, m2);
break;
case 'm':
ans = MatrixMul(m1, m2);
break;
case 'i':
ans = MatrixInv(m1);
break;
case 'c':
ans = MatrixSMul(m1, i2f(sc));
break;
default:
printf("Something went very wrong.\n");
return 1;
}
printf("Answer:\n");
MatrixPrint(ans);
MatrixFree(m1);
MatrixFree(ans);
if(op == 'a' || op == 's' || op == 'm'){
MatrixFree(m2);
}
return 0;
}
/** Inverses mx.
* Returns materr(2) if mx isn't a square, 2x2 matrix,
* or materr(1) if the initialization didn't go right.
*/
matrix MatrixInv(matrix mx)
{
if (!isValidOp(mx,mx,'i')) {
return materr(2);
}
if(mx.rows == 2) {
matrix inv = initialize(mx.rows, mx.columns);
if(inv.mx == NULL) {
return materr(1);
}
frac tmp;
frac det = fdiv(i2f(1),
fsub(fmul(mx.mx[0][0], mx.mx[1][1]),
fmul(mx.mx[0][1], mx.mx[1][0])));
tmp = mx.mx[0][0];
inv.mx[0][0] = mx.mx[1][1];
inv.mx[1][1] = tmp;
inv.mx[0][1] = fmul(mx.mx[0][1], i2f(-1));
inv.mx[1][0] = fmul(mx.mx[1][0], i2f(-1));
return MatrixSMul(mx, det);
} else {
return materr(2);
}
}
int main(void)
{
char mStr[1024];
matrix *ans, *m1, *m2;
int sc = 0;
printf("Which operation: ");
char op = tolower(getchar());
while(op != '+' || op != '-' || op != '*' || op != '/' || op != 'i') {
puts(opErr);
op = tolower(getchar());
}
printf("First matrix:\n");
scanf("%s", mStr);
m1 = MatrixInit(mStr);
MatrixPrint(m1);
if(op == 'a' || op == 's' || op == 'm') {
printf("Second matrix:\n");
scanf("%s", mStr);
m2 = MatrixInit(mStr);
MatrixPrint(m2);
} else if(op == 'c') {
printf("Scalar multiple:\n");
scanf("%d", &sc);
}
switch(op) {
case 'a':
ans = MatrixAdd(m1, m2);
break;
case 's':
ans = MatrixSub(m1, m2);
break;
case 'm':
ans = MatrixMul(m1, m2);
break;
case 'i':
ans = MatrixInv(m1);
break;
case 'c':
ans = MatrixSMul(m1, sc);
break;
default:
printf("Something went very wrong.\n");
return 1;
}
printf("Answer:\n");
MatrixPrint(ans);
MatrixFree(m1);
MatrixFree(ans);
if(op == 'a' || op == 's' || op == 'm') {
MatrixFree(m2);
}
return 0;
}
