Switch statements
The switch statement is a multi-way decision that tests whether an expression matches one of a number of constant integer values, and branches accordingly.switch (expression)
{
case const-expr: statements
case const-expr: statements
default: statements
}
Each case is labeled by one or more integer-valued constants or constant expressions. If a case matches the expression value, execution starts at that case. All case expressions must be different. The case labeled default is executed if none of the other cases are satisfied. A default is optional; if it isn't there and if none of the cases match, no action at all takes place. Cases and the default clause can occur in any order. we wrote a program to count the occurrences of each digit, white space, and all other characters, using a sequence of if ... else
if ... else. Here is the same program with a switch:
#include <stdio.h>
main() /* count digits, white space, others */
{
int c, i, nwhite, nother, ndigit[10];
nwhite = nother = 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-'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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For statements in C programming language
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