Thread: Error...Help!![Warning] overflow in implicit constant conversion [-Woverflow]

while(fread(&stu, sizeof(stu),1,fp) == 1){
if(strcmp(s_id, stu.ID) == 0){
fflush(stdin);
gotoxy(print,12);printf("ID: ");gets(stu.ID);
gotoxy(print,13);printf("Name: ");gets(stu.name);
gotoxy(print,14);printf("Address: ");gets(stu.add);
gotoxy(print,15);printf("Parent's name: ");gets(stu.parname);
gotoxy(print,16);printf("Class: ");scanf("%d",&stu.Class);
gotoxy(print,17);printf("Phone Number: ");scanf("%ld",&stu.phone_no);
fseek(fp,-sizeof(stu), SEEK_CUR);
fwrite(&stu,sizeof(stu), 1, fp);
isFound = 1;
break;



how to eliminate the error?
fseek(fp,-sizeof(stu), SEEK_CUR);
help...!

Thank you. could you write the coding? i don't get what you mean excatly

I am a beginner in c...and i need this for my homework..thanks a lot for your help.

Originally Posted by Carlies

while(fread(&stu, sizeof(stu),1,fp) == 1){
if(strcmp(s_id, stu.ID) == 0){
fflush(stdin);
gotoxy(print,12);printf("ID: ");gets(stu.ID);
gotoxy(print,13);printf("Name: ");gets(stu.name);
gotoxy(print,14);printf("Address: ");gets(stu.add);
gotoxy(print,15);printf("Parent's name: ");gets(stu.parname);
gotoxy(print,16);printf("Class: ");scanf("%d",&stu.Class);
gotoxy(print,17);printf("Phone Number: ");scanf("%ld",&stu.phone_no);
fseek(fp,-sizeof(stu), SEEK_CUR);
fwrite(&stu,sizeof(stu), 1, fp);
isFound = 1;
break;



how to eliminate the error?
fseek(fp,-sizeof(stu), SEEK_CUR);
help...!

You have several problems with the code presented:

1) You do not present the entire program, only a section of the code. It is impossible for us to attempt to compile your code to find the errors.

2) You appear to be using conio. conio is non standard and should be avoided. You could use a curses library which is available for Windows, Linux, and probably other O/Ss.

3) You are using gets() which should NEVER be used, has been depreciated in the C99 C Standard, and has been eliminated in the C11 Standard. fgets() should be used instead.

4) flush(stdin), again, should NEVER be used! The following is the better alternative:

Code:

int ch;
while ((ch = getchar()) != '\n' && ch != EOF);

5) sizeof(), strlen(), and others return a size_t value, an unsigned integer type, implementation defined.

Start with resolving these problems

Okay,thank you for giving me such helpful advice.