47 lines
640 B
Plaintext
47 lines
640 B
Plaintext
1. gedit cal.c
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****
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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int main(int argc, char **args)
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{
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if(argc <4)
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{
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printf("wrong!the correct usage is");
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return 0;
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}
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int a = atoi(args[1]);
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int b = atoi(args[3]);
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char c = args[2][0];
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switch(c){
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case '+':{
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printf("%d\n",a+b);
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break;
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}
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case '-':{
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printf("%d\n",a-b);
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break;
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}
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case '*':{
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printf("%d\n",a*b);
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break;
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}
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case '/':{
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printf("%d\n",a/b);
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break;
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}
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default:{
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printf("error");
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break;
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}
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}
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return 0;
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}
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***********************
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2 gcc cal.c -o cal-86
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3 ./cal-86 3 + 9
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4 arm-linux-gcc cal.c -o cal-arm（source /etc/profile）
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ls
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