Getting multiple values with scanf()
You can do this with a single call, like so: scanf( “%i %i %i %i”, &minx, &maxx, &miny, &maxy);
scanf
Format specifiers for uint8_t, uint16_t, …?
They are declared in <inttypes.h> as macros: SCNd8, SCNd16, SCNd32 and SCNd64. Example (for int32_t): sscanf (line, “Value of integer: %” SCNd32 “\n”, &my_integer); Their format is PRI (for printf)/SCN (for scan) then o, u, x, X d, i for the corresponding specifier then nothing, LEAST, FAST, MAX then the size (obviously there is no … Read more
Program doesn’t execute gets() after scanf(), even using fflush(stdin)
If flushing std doesn’t work, then try reading in the extra characters and discarding, as suggested here. This will work: #include <string.h> #include <stdio.h> int main(){ char nombre[10]; char mensaje[80]; int c; printf(“Type your name:\n”); scanf(“%9s”, nombre); while((c= getchar()) != ‘\n’ && c != EOF) /* discard */ ; printf(“Now, type a message:\n”); gets(mensaje); printf(“%s:%s”,nombre,mensaje); … Read more
C – trying to read a single char from stdin (and failing) w/ scanf / getchar
You need a space between scanf(” and the %c for it to work correctly: scanf(” %c”, &choice); And you also need to use &choice, not choice! EDIT: While you’re at it, you might want to look into do while() for that loop (unless the professor specifically said to use a break) – do while works … Read more
Get scanf to quit when it reads a newline?
Use fgets to read console input: int res = 2; while (res == 2) { char buf[100]; fgets(buf, sizeof(buf), stdin); res = sscanf(buf, “%f %f”, &real, &img); if (res == 2) c[i++] = real + img * I; } c[i++] = 1 + 0*I; // most significant coefficient is assumed to be 1 return i;
What is the format specifier for unsigned short int?
Try using the “%h” modifier: scanf(“%hu”, &length); ^ ISO/IEC 9899:201x – 7.21.6.1-7 Specifies that a following d , i , o , u , x , X , or n conversion specifier applies to an argument with type pointer to short or unsigned short.
Scanf causes C program to crash
You must pass the address of the variable to scanf: scanf(“%c”, &answer);
How to only accept a certain precision (so many decimals places) in scanf?
scanf() does not have a simple method to meet OP’s goal. Recommend using fgets() for input and then parse the string. char buf[20]; fgets(buf, sizeof buf, stdin); // Could add check for NULL here To limit to 2 decimal places, code could read the number in parts: integer portion and fraction, then form the result: … Read more
Why scanf(“%d”, […]) does not consume ‘\n’? while scanf(“%c”) does?
It is consistent behavior, you’re just thinking about it wrong. 😉 scanf(“%c”, some_char); // reads a character from the key board. scanf(“%d”, some_int); // reads an integer from the key board. So if I do this: printf(“Insert a character: “); scanf(“%c”, &ch); // if I enter ‘f’. Really I entered ‘f’ + ‘\n’ // scanf … Read more
Looking for C# equivalent of scanf
Since the files are “semi-structured” can’t you use a combination of ReadLine() and TryParse() methods, or the Regex class to parse your data?