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parsing and checking integers off a line
Character Strings example from a Well House Consultants training course
More on Character Strings [link]
Source code: p022.c Module: C206
/* String handling examples
parsing and checking integers off a line */ #include <stdio.h> #include <strings.h> #include <stdlib.h> #include <errno.h> main () { char input[1025]; char *whole, *item; /* these are pointers and NOT actual memory allocations! */ char *debris; int value; printf("please enter your name "); fgets(&input[0],1024,stdin); /* has new line on end */ input[strlen(input)-1] = '\0'; printf("Hello %s and welcome\n",input); /* pointer (to first element) */ /* Duplicate the string into a "malloc'd" area so we can work on it */ whole = strdup(input); while ((item = strsep(&whole," ")) != NULL) { printf("%-20s",item); /* Get number, checking for overflow error */ errno = 0; value=(int)(strtol(item,&debris,10)); /* Did we really get a number? */ if (strcmp(item,debris)) { if (errno) { printf("Overflow!\n",value); } else { printf("%05d\n",value); } } else { printf("nah!\n"); } } } /* Sample Output ......... munchkin:cj16 grahamellis$ ./p022 please enter your name jsjksd skjfjkds kjsfjsdf 43 43 23 5 -6 2342 323423423423234234234324 44 dfgd 44 Hello jsjksd skjfjkds kjsfjsdf 43 43 23 5 -6 2342 323423423423234234234324 44 dfgd 44 and welcome jsjksd nah! skjfjkds nah! kjsfjsdf nah! 43 00043 43 00043 23 00023 5 00005 -6 -0006 2342 02342 323423423423234234234324Overflow! 44 00044 dfgd nah! 44 00044 munchkin:cj16 grahamellis$ */ Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in C * Learning to program in C and C++ * Programming in C * C and C++ Programming * Learning to program in C and C++ * C and C++ Programming Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Character Strings" training module. You'll find a description of the topic and some
other closely related examples on the "Character Strings" module index page.
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