int main(void){ //initialize main with void return type.
long int userx; //user inputed x
long int yval; //yvalue
char buf[BUFSIZ]; //create a buffer with the defined buffer size
char *c; //character used for checking to make sure user entered an integer
while(1<2){
printf("Please input an integer value for x: "); //ask for user input
if (fgets(buf, sizeof(buf), stdin) != NULL) //get user input and store in buffer
{
userx = strtol(buf, &c, 10); //convert to long
if (buf[0] != '\n' && (*c == '\n' || *c == '\0')){ //check to make sure user actually entered a value and that value is an integer
yval = fofx(userx); //get y value
printf ("The value of the polynomial for x = %ld is: %ld\n", userx,yval); //display output
break; //exit loop
}
else {
printf ("Please enter only an integer value\n"); //user entered and invalid integer, loop repeats.
}
}
}
return(0); //return zero value, aka indicate everything worked as expected
}
int main(){
int inputNum;
int num1;
int num2;
int array1[ARRAY_SIZE];
int array2[ARRAY_SIZE];
int results[2 * ARRAY_SIZE];
fillArrayWithZeroes(array1, ARRAY_SIZE);
fillArrayWithZeroes(array2, ARRAY_SIZE);
fillArrayWithZeroes(results, (2 * ARRAY_SIZE));
char ch;
scanf("%d%c%d", &num1, &ch, &num2);
printf("num1 = %d\n", num1);
printf("num2 = %d\n", num2);
//Check for bad stdin inputs
if ((num1 >= 100) || (num1 <= -100))
{
printf("num1 not in the range [-100, 100]!\n");
return -1;
}
else if ((num2 >= 100) || (num2 <= -100))
{
printf("num2 not in the range [-100, 100]!\n");
return -1;
}
else if ((num1 < 1) || (num1 < 1)){
printf("Input for n cannot be smaller than one!");
return -1;
}
else if ((num2 < 1) || (num2 < 1)){
printf("Input for n cannot be smaller than one!");
return -1;
}
else if (ch != ' '){
printf("Found a char that isn't space in stdin!");
return -1;
}
fillArrayWithCoefficients(array1, num1);
fillArrayWithCoefficients(array2, num2);
printArray(array1, num1);
printArray(array2, num2);
printf("f(x) = ");
printPoly(array1, num1);
printf("g(x) = ");
printPoly(array2, num2);
for(int i = 0; i < num2; i++) {
for(int j = 0; j < num1; j++) {
results[i + j] = results[i + j] + (array2[i] * array1[j]);
}
}
printf("f(x)g(x) = ");
printPoly(results, (num1 + num2 - 1));
printf("f(1)g(1) = %d\n", fofx(results, (num1 + num2 - 1), 1));
}
