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September 13, 2018 19:33
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Example of Switch
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/*Example from book the C programing language | |
* by Brian W.Kernighan and Dennis M. Ritchie | |
*/ | |
#include <stdio.h> | |
int main(){ | |
int c, i, nwhite, nother, ndigit[10]; | |
nwhite = nother = 0; | |
//reset the array to 0 | |
for (i = 0; i < 10; i++) | |
ndigit[i] = 0; | |
while ((c = getchar()) != EOF){ | |
switch(c){ | |
case '0': case '1':case '2': case '3':case '4': | |
case '5': case '6':case '7': case '8':case '9': | |
//ndigit[c]++; | |
//you may ask why don't we use it | |
//the reason is c store an int code match with char not | |
//an actual int, in this case '0' is 48, it's out of range of | |
//our ndigit array | |
ndigit[c-'0']++; | |
break; | |
case ' ': | |
case '\n': | |
case '\t': | |
nwhite++; | |
break; | |
default: | |
nother++; | |
break; | |
} | |
} | |
printf("digits = "); | |
for (i = 0; i < 10; i++) | |
printf(" %d", ndigit[i]); | |
printf(", white space = %d, other = %d\n", | |
nwhite, nother); | |
return 0; | |
} |
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