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Implemented a suggestion from Affine to replace the many if statements with a single switch and only ever call getchar at one point in the code.

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Reina Harrington-Affine 2025-08-14 22:32:02 +00:00
parent 43f172da21
commit d3ce211f14
1 changed files with 18 additions and 21 deletions
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39
KNR C/ex1_10_goto.c
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@ -1,34 +1,31 @@
#include <stdio.h> #include <stdio.h>
#include <stdlib.h>
/*A really silly way to complete exercise 1-10 of KNR C*/ /*A really silly way to complete exercise 1-10 of KNR C*/
int main(){ int main(){
int a = getchar(); /*There is, unfortuately, no immediately obvious way to avoid repeating this since we need to initialize 'a' in order to have valid data for everything beyond this line*/
if (a == EOF){ /*Check whether first character is EOF*/
printf ("Error: No data to parse. \n Exiting.");
EXIT_FAILURE; /*Exit if there is no data to parse.*/
}
loop_start: /*Goto will circle back to the next line if a != EOF*/ loop_start: /*Goto will circle back to the next line if a != EOF*/
if (a == '\t' || a == '\b' || a == '\\'){
if (a == '\t')
printf("\\t");
if (a == '\b')
printf("\\b");
if (a == '\\')
printf ("\\\\");
} else {
putchar(a);
}
a = getchar(); int a = getchar();
switch (a){
case EOF:
break;
case '\t':
printf("\\t");
break;
case '\b':
printf("\\b");
break;
case '\\':
printf("\\\\");
break;
default:
putchar (a);
break;
}
if (a != EOF) /*Only trigger next loop if 'a' contains valid data.*/ if (a != EOF) /*Only trigger next loop if 'a' contains valid data.*/
goto loop_start; goto loop_start;
return 0; return 0;
} }