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#include <stdio.h>
#include <stdlib.h>
/* Enums make words into numbers, ergo no magic numbers */
enum MODE {
MODE_MAX,
MODE_MIN,
MODE_DIFF
};
void help(){
printf("Usage: stats <numbers>\n");
exit(1);
}
/* ADDING UP ALL THE VALUES */
long sigma(int argc, char * argv[]) {
char *endptr;
long sum = 0;
for (int i = 1; i < argc; i++) {
sum += strtol(argv[i], &endptr, 10); /* convert the value to an integer and add it on */
if (endptr == argv[i] || *endptr != '\0') {
help();
}
}
return sum;
}
/* FINDING MEAN */
float average(int n, int sum) {
float mean = (float) sum / n;
return mean;
}
/* FINDING THE MIN/MAX/DIFFERENCE */
long range(int argc, char * argv[], enum MODE mode) {
long low = strtol(argv[1], NULL, 10);
long high = low;
for (int i = 1; i < argc; i++) {
long val = strtol(argv[i], NULL, 10);
if (val > high) high = val;
if (low > val) low = val;
}
/* Check once and return what we need */
switch (mode) {
case MODE_MAX:
return high;
case MODE_MIN:
return low;
case MODE_DIFF:
return high - low;
}
return 1;
}
int main(int argc, char * argv[]) {
if (argc < 2) { /* Stop empty input */
help();
}
long n = argc - 1; /* this is how many numbers there are */
long sum = sigma(argc, argv); /* sigma means adding them all together */
float mean = average(n, sum); /* the sum divided by the however many numbers there are */
long min = range(argc, argv, MODE_MIN); /* Using enums here to use words instead of numbers */
long max = range(argc, argv, MODE_MAX);
long diff = range(argc, argv, MODE_DIFF);
/* align text left for 6 and 12 right */
printf("%-6s %12ld\n", "num:", n);
printf("%-6s %12ld\n", "sum:", sum);
printf("%-6s %12.3f\n", "mean:", mean);
printf("%-6s %12ld\n", "min:", min);
printf("%-6s %12ld\n", "max:", max);
printf("%-6s %12ld\n", "range:", diff);
}
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