Thread: Conversion Specifier

As soon as this program gets to the scanf line that has a precision specification, it jumps to the end of the program. I assume that a character is somehow getting into the subsequent scanf and getchar, but I don't see how that would happen. Can anybody tell me what is happening here? Also if I put a space between %lf and %*c it takes 2 enter presses to proceed and I don't know why that is either.

Thanks

Code:

#include <stdio.h>

#define STORE_NAME "Sierra Sporting Goods"


int main(void){
    int intNumber, intType, intQuantity;
    double dblCost, dblPrice;
    
    printf("%s\n", STORE_NAME);                          /*prompt for input*/
    printf("\n\nEnter the product number: ");
    scanf("%04d%*c", &intNumber);
    printf("\nEnter the product type: ");
    scanf("%d%*c", &intType);
    printf("\nEnter the quantity: ");
    scanf("%d%*c", &intQuantity);
    printf("\nEnter the cost: ");
    scanf("%.2lf%*c", &dblCost);              //<==== the .2 is my problem
    printf("\nEnter the price: ");
    scanf("%.2lf%*c", &dblPrice);             //<==== the .2 is my problem


    printf("\n\nThe product number is %d", intNumber);   /*Display values*/
    printf("\nThe product type is %d", intType);
    printf("\nThe quantity type is %d", intQuantity);
    printf("\nThe cost is %lf", dblCost);
    printf("\nThe price is %lf", dblPrice);
    
    printf("\nPress enter to continue\n");
    
    getchar();
  
   
 return 0;
    
}

%.2lf is not a valid conversion specifier for scanf. There is no precision on input, only output.

As to the other, a space in an input format string matches any and every whitespace, hence the first enter key would match the space and not the %*c.

Thanks.

Is that also to say that there is no width on input either(i have %04d in a scanf)?

and

Does "%04d" do something different than "%4d"?

You can have field width, sure. 04 is octal, and 4 is decimal, but in this case they both equal the same number. (0 doesn't mean anything special in scanf like it does in printf.)

On output only. Let's say x = 12;

printf("%d",x) produces 12;
printf("%04d",x) produces 0012;

The leading 0 will pad the output.