scanf

来源： https://stackoverflow.com/questions/63457609/read-a-line-from-file-in-c-and-extract-the-number-of-input

来源： https://stackoverflow.com/questions/63586535/fast-char-to-int-and-fast-read-of-last-letter-in-c11

来源： https://stackoverflow.com/questions/53726736/how-do-i-limit-the-input-of-scanf-to-integers-and-floats-numbers-in-general

问题 I'm not new at writing code. But I'm just learning C language. I cannot understand this subject. Perhaps it is not an issue but now it is an issue for me. Would you please explain that? Here is code, where I encounter with this: #include <stdio.h> int main(int argc, char *argv[]) { char letter; while (1) { printf("Enter a letter:\n"); scanf("%c", &letter); switch (letter) { case 'a': case 'A': case 'e': case 'E': case 'i': case 'I': case 'u': case 'U': case 'o': case 'O': printf("%c is a

问题 I'm not new at writing code. But I'm just learning C language. I cannot understand this subject. Perhaps it is not an issue but now it is an issue for me. Would you please explain that? Here is code, where I encounter with this: #include <stdio.h> int main(int argc, char *argv[]) { char letter; while (1) { printf("Enter a letter:\n"); scanf("%c", &letter); switch (letter) { case 'a': case 'A': case 'e': case 'E': case 'i': case 'I': case 'u': case 'U': case 'o': case 'O': printf("%c is a

问题 Does the input buffer gets cleared after scanf reads? #include <stdio.h> int main(void) { int a, b; scanf("%d", &a);//I inputted 3 scanf("%d", &b);//I inputted 4 } So when I gave the input 4 was 3 present in the input buffer? 回答1: So when I gave the input 4 was 3 present in the input buffer? No, the 3 was consumed. You cannot re-read it (as int or otherwise). If you input "3<enter>" the 3 is consumed and the buffer contains just the "<enter>" . You then type "4<enter>" which is added to the

问题 I have text file contain data like which contain key value pairs (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) each item separated by space and there is a space after comma I want to read each element and print those item one by the (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) I tried using while (fscanf(file, "%s", value) == 1) { printf(value); } but not it separated each value with comma (Ann, 67) (Jhon, 78) (Mason, 89) How can I do that 回答1: As I mentioned in my

问题 I have text file contain data like which contain key value pairs (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) each item separated by space and there is a space after comma I want to read each element and print those item one by the (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) I tried using while (fscanf(file, "%s", value) == 1) { printf(value); } but not it separated each value with comma (Ann, 67) (Jhon, 78) (Mason, 89) How can I do that 回答1: As I mentioned in my

问题 I know there's a question here but I really don't understand what the OP did. I've used x86 assembly before and for that you'd do something like this: push dword int1 push dword fmtInput call scanf add esp, 12 ; value is now in int1 my guess for ARM is something like this ldr r0, fmtInput push r1 @ says this is too complex, tried `ldr r1` but that also failed saying that ldr needed more inputs bl scanf @ I'm assuming the value is now in r1 I'm sure I'm missing something simple but I'm really

问题 I know that the code will not work (program is not complete, I am at the beginning in creating a linked list), but I noticed something weird. #include <stdio.h> struct mychar { char value; struct mychar *nextPtr; }; typedef struct mychar Mychar; void instructions(); void append(Mychar **, char ); int main(){ instructions(); Mychar *startPtr = NULL; unsigned int choice; do { scanf("%d",&choice); if (choice==1){ char newchar; printf("\nWrite the character you want to add."); printf("\n> ");