二进制有符号数补码计算器

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二进制有符号数补码计算器

这里写自定义目录标题

• 起因
• 运行结果
• Code
• attention

起因

Modelsim中的结果是以十六进制有符号数的形式给出的，不方便观察，所以想把它转成十进制数，然而没有找到合适的工具，无奈自己用C语言写了一个。

运行结果

Code #include <stdio.h> #include <stdlib.h> #include <string.h> char* fun(char ch); char str1[] = "1234"; int main() { int width = 16; char hex[] = "ffffffff"; char *complement; char *t_complement; char *reverse; char *original; int B_num = 0; int data = 0; int scanf_len = 0; int i; while(1){ printf("\\n请输入宽度:"); scanf("%d", &width); printf("\\n请输入十六进制数:"); scanf_len = scanf("%s", hex); B_num = (width+3)/4; if( strlen(hex)!= B_num) { printf("！！！输入错误！！！"); exit(0); } else { printf("十六进制数：%s\\n", hex); } complement = (char*)malloc((B_num*4+5)*sizeof(char)); memset(complement, 0, sizeof(complement)); t_complement = (char*)malloc((width+5)*sizeof(char)); memset(t_complement, 0, sizeof(t_complement)); reverse = (char*)malloc((width+5)*sizeof(char)); memset(reverse, 0, sizeof(reverse)); original = (char*)malloc((width+5)*sizeof(char)); memset(original, 0, sizeof(original)); for(i=0; i<B_num; i++) { // ????????¡ã¨¦????????????????????¨¦????¡ã???????????? memcpy(complement+4*i, fun(hex[i]), 4); } complement[B_num*4] = '\\0'; for(i=0; i<width; i++) { t_complement[i] = complement[i+(B_num*4-width)]; } t_complement[width] = 0; if(t_complement[0] == '1') { // ?¡¦????complement???¨¦?????????????? for(i=0+(B_num*4-width); i<B_num*4; i++) { if(i == (B_num*4-width)) reverse[i-(B_num*4-width)] = complement[i]; else if(complement[i] == '1') reverse[i-(B_num*4-width)] = '0'; else reverse[i-(B_num*4-width)] = '1'; } reverse[width] = 0; char carry = 1; // ?¡¦????complement???¨¦?????????????? for(i=width-1; i>=0; i--) { if(i == 0) original[i] = reverse[i]; else if(carry == 1){ if(reverse[i] == '1'){ original[i] = '0'; carry = 1; } else{ original[i] = '1'; carry = 0; } } else{ if(reverse[i] == '1'){ original[i] = '1'; } else{ original[i] = '0'; } } } original[width] = 0; } else{ memcpy(reverse, t_complement, width); memcpy(original, t_complement, width); } int base = 1; for(i=width-1; i>=0; i--) { if(i == 0){ if(original[i] == '1') data *= -1; } else{ data = data + (original[i]-'0')*base; base *= 2; } } // printf("%d %d %d", sizeof(int), sizeof(long int), sizeof(long long int)); printf("原码:%s\\n", complement); printf("原码:%s\\n", t_complement); printf("反码:%s\\n", reverse); printf("补码:%s\\n", original); printf("十进制数：%d\\n", data); printf("=================================================\\n\\n"); } return 0; } char* fun(char ch) { switch(ch) { case '0': memcpy(str1, "0000", 4); break; case '1': memcpy(str1, "0001", 4); break; case '2': memcpy(str1, "0010", 4); break; case '3': memcpy(str1, "0011", 4); break; case '4': memcpy(str1, "0100", 4); break; case '5': memcpy(str1, "0101", 4); break; case '6': memcpy(str1, "0110", 4); break; case '7': memcpy(str1, "0111", 4); break; case '8': memcpy(str1, "1000", 4); break; case '9': memcpy(str1, "1001", 4); break; case 'a': case 'A': memcpy(str1, "1010", 4); break; case 'b': case 'B': memcpy(str1, "1011", 4); break; case 'c': case 'C': memcpy(str1, "1100", 4); break; case 'd': case 'D': memcpy(str1, "1101", 4); break; case 'e': case 'E': memcpy(str1, "1110", 4); break; case 'f': case 'F': memcpy(str1, "1111", 4); break; default: printf("???????????¨ª?¨®??????\\n"); exit(0); break; } return str1; } attention

如果输入的宽度和字符串不匹配会自动结束程序。

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本文标签： 补码计算器符号