<\/p>\n\n\n\n
$ls\nfirst-example first-example.c new-sum.c sum sum.c\n$cat new-sum.c \n#define _XOPEN_SOURCE 500\n#include <stdio.h>\n#include <stdlib.h>\n#include <unistd.h>\nvoid printhelp(char progname[]);\n\nint main(int argc, char *argv[])\n{\n int i, opt, sum;\n\n \/* Simple sanity check *\/\n if (argc == 1)\n {\n printhelp(argv[0]);\n return 1;\n }\n\n \/* Parse command-line options *\/\n while ((opt = getopt(argc, argv, \"smh\")) != -1)\n {\n switch (opt)\n {\n case 's': \/* sum the integers *\/\n sum = 0;\n for (i=2; i<argc; i++)\n sum = sum + atoi(argv[i]);\n break;\n case 'm': \/* multiply the integers *\/\n sum = 1;\n for (i=2; i<argc; i++)\n sum = sum * atoi(argv[i]);\n break;\n case 'h': \/* -h for help *\/\n printhelp(argv[0]);\n return 0;\n default: \/* in case of invalid options*\/\n printhelp(argv[0]);\n return 1;\n }\n }\n printf(\"Total: %i\\n\", sum);\n return 0;\n}\n\nvoid printhelp(char progname[])\n{\n printf(\"%s [-s] [-m] integer ...\\n\", progname);\n printf(\"-s sums all the integers\\n\"\n \"-m multiplies all the integers\\n\"\n \"This program takes any number of integer \"\n \"values and either add or multiply them.\\n\"\n \"For example: %s -m 5 5 5\\n\", progname);\n}\n$ls\nfirst-example first-example.c new-sum.c sum sum.c\n$gcc new-sum.c \n$rm a.out \n$gcc new-sum.c -o new-sum\n$.\/new-sum\n.\/new-sum [-s] [-m] integer ...\n-s sums all the integers\n-m multiplies all the integers\nThis program takes any number of integer values and either add or multiply them.\nFor example: .\/new-sum -m 5 5 5\n$.\/new-sum -m 3 3\nTotal: 9\n$.\/new-sum -s 3 3\nTotal: 6\n$\n<\/pre>\n","protected":false},"excerpt":{"rendered":"$ls first-example first-example.c new-sum.c sum sum.c $cat new-sum.c #define _XOPEN_SOURCE 500 #include <stdio.h> #include <stdlib.h> #include <unistd.h> void printhelp(char progname[]); int main(int argc, char *argv[]) { int i, opt, sum; \/* Simple sanity check *\/ if (argc == 1) { printhelp(argv[0]); return 1; } \/* Parse command-line options *\/ while ((opt = getopt(argc, argv, “smh”)) … <\/p>\n