How to use PlaySound in C?

How do I use double in C?

• char a; int b; double c; getchar(); printf("insert a char\n"); getchar(); scanf("%c", &a); printf("\n"); printf("insert an int\n"); scanf("%i", &b); printf("insert a double\n"); scanf("%g", &c); printf("%c, %i, %g", a,b,c); for some reason, the it never allows the user to insert a double and instead goes to last command with a ? in the place of double. I tried using %lf,%f but it doesnt work.

• Answer:

  Two basic problems: - the getchar call after you prompt for a char is discarding the entered character. - in your scanf for double, %g should be %lf Test your code with bogus entries, and I'm sure you'll see undesirable behavior. I recommend adding at least some rudimentary input validation. Here are my modifications to your code: #include <stdio.h> #include <string.h> #define MAX_LINE_LEN 32 char *getline(void); int main(int argc, char *argv[]) {    char a;    int b;    double c;    do {       printf("insert a char: ");    } while (sscanf(getline(),"%c", &a) != 1);    do {       printf("insert an int: ");    } while (sscanf(getline(),"%i", &b) != 1);    do {       printf("insert a double: ");    } while (sscanf(getline(),"%lf", &c) != 1);    printf("%c, %i, %g\n", a,b,c);    return 0; } char *getline() {    static char line[MAX_LINE_LEN];    fgets(line,MAX_LINE_LEN,stdin);    *(strchr(line,'\n')) = '\0';    return line; } #if 0 Sample run: insert a char: insert a char: x insert an int: y insert an int: 99 insert a double: . . . insert a double: 0.25 x, 99, 0.25 #endif