Most common syntax error in c programming

Error is dividing in 2 parts, syntax error and logic error

Logic error is hard to find, no easy way to detect it

Syntax error is easier since the dev c will give error message if there are syntax error, here is the common errors in c programming

1. Forgot the “;” in the end of statement à the most common beginner mistake

2. Case sensitive, a and A is different in c language, make sure you type it right

3. What header should I include? if you type the statement sin(x) but you don’t include the header math.h there will be an error when you compile the program, but what about the other statement? Here the list of header and the statement in dev c (you can also see this list in the help file dev c with keyword:header)

List of header

Input and Output: <stdio.h>

FILE *fopen(const char *filename, const char *mode)
FILE *freopen(const char *filename, const char *mode, FILE *stream)
int fflush(FILE *stream)
int fclose(FILE *stream)
int remove(const char *filename)
int rename(const char *oldname, const char *newname)

FILE *tmpfile(void)
char *tmpnam(char s[L_tmpnam])
int setvbuf(FILE *stream, char *buf, int mode, size_t size)
void setbuf(FILE *stream, char *buf)
int fprint(FILE *stream, const char *format, ...)
int sprintf(char *s, const char *format, ...)
vprintf(const char *format, va_list arg)
vfprintf(FILE *stream, const char *format, va_list arg)
vsprintf(char *s, const char *format, va_list arg)
int fscanf(FILE *stream, const char *format, ...)
int scanf(const char *format, ...)

int sscanf(char *s, const char *format, ...)
int fgetc(FILE *stream)
char *fgets(char *s, int n, FILE *stream)
int fputc(int c, FILE *stream)
int fputs(const char *s, FILE *stream)
int getc(FILE *stream)
int getchar(void)
char *gets(char *s)
int putc(int c, FILE *stream)
int putchar(int c)
int ungetc(int c, FILE *stream)
size_t fread(void *ptr, size_t size, size_t nobj, FILE *stream)
size_t fwrite(const void *ptr, size_t size, size_t nobj, FILE *stream)

int fseek(FILE *stream, long offset, int orogin)
long ftell(FILE *stream)
void rewind(FILE *stream)
int fgetpos(FILE *stream, fpos_t *ptr)
int fsetpos(FILE *stream, const fpos_t *ptr)
void clearerr(FILE *stream)
int feof(FILE *stream)
int ferror(FILE *stream)
void perror(const char *s)


Character Class Tests: <ctype.h>

isalnum(c)
isalpha(c)
iscntrl(c)
isdigit(c)
isgraph(c)
islower(c)
isprint(c)
ispunct(c)
isspace(c)
isupper(c)
isxdigit(c)

String Functions: <string.h>

char *strcpy(s , ct)
char *strncpy(s , ct , n)
char *strcat(s , ct)
char *strncat(s , ct , n)
int strcmp(cs , ct)
int strncmp(cs , ct ,n)
char *strchr(cs , c)
char *strrchr(cs , c)
size_t strspn(cs , ct)
size_t strcspn(cs , ct)
char *strstr(cs , ct)
size_t strlen(cs)
char *strerror(n)
char *strtok(s , ct)


Mathematical Functions: <math.h>

sin(x)
cos(x)
tan(x)
asin(x)
acos(x)
atan(x)
atan2(x)

sinh(x)
cosh(x)
tanh(x)
exp(x)
log(x)
log10(x)
pow(x,y)
sqrt(x)
ceil(x)
floor(x)
fabs(x)
ldexp(x)
frexp(x,double *ip)
modf(x,double *ip)
fmod(x,y)


Utility Functions: <stdlib.h>

double atof(const char *s)
int atoi(const char *s
long atol(const char *s)
double strrod(const char *s, char **endp)
long strtol(const char *s, char **endp, int base)
unsigned long strtoul(const char *s, char **endp, int base)
int rand(void)
void srand(unsigned int seed)

void *calloc(size_t nobj, size_t size)
void *malloc(size_t size)
void *realloc(void *p, size_t size)
void free(void *p)
void abort(void)
void exit(int status)
int atexit(void (*fcn)(void))
int system(const char *s)
char *getenv(const char *name)
void *bsearch(const void *key, const void *base, size_t n, size_t size, int (*cmp)(const void *keyval, const void *datum))
void qsort(void *base, size_t n, size_t size, int (*cmp)(const void *, const void *))

int abs(int n)
long labs(long n)
div_t div(int num, int denom)
ldiv_t ldiv(long num , long denom)


Diagnostics: <assert.h>

void assert(int expression)


Non-local Jumps: <setjmp.h>

int setjmp(jmp_buf env)
void longjmp(jmp_buf env, int val)



Signals: <signal.h>

void (*signal(int sig, void (*handler)(int)))(int)

Data and Time Functions: <time.h>

clock_t clock(void)

time_t time(time_t , *tp

double difftime(time_t time2 , time_t time1)

time_t mktime(struct tm *tp)

char *asctime(const time_t *tp)

char *ctime(const time_t *tp)

struct tm *gmtime(const time_t *tp)

struct tm *localtime(const time_t *tp)

size_t strftime(char *s, size_t smax, const char *fmt, const struct tm *tp)