032_ParEntrada.c

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#include<stdio.h>
 
int str2int(char str[])
{
    int num = 0;
    int i = str[0]=='-'?1:0;
    while(str[i]>='0'&&str[i]<='9')
    {
        num *= 10;
        num += (str[i++]-'0');
    }
    return str[0]=='-'?-num:num;
}
 
float str2float(char str[])
{
    float num = 0;
    int i = str[0]=='-'?1:0, p10=10;
    while(str[i]>='0'&&str[i]<='9')
    {
        num *= 10;
        num += (str[i++]-'0');
    }
    if(str[i++]!='.')
        return str[0]=='-'?-num:num;
    while(str[i]>='0'&&str[i]<='9')
    {
        num += (str[i++]-'0')/((float)p10);
        p10 *= 10;
    }
    return str[0]=='-'?-num:num;
}
 
int main(int argc, char *argv[])
{
    int i;
    float s, d;
    if(argc==1)
    {
        printf("Uso: %s A B\n", argv[0]);
        return 1;
    }
    for(i=1, s=0; i<argc; i++)
    {
        d = str2float(argv[i]);
        s += d;
        printf("%d-> %f\t%f\n", i, d, s);
    }
    printf("Suma = %f\n", s);
    return 0;
}