c programming, read a string from File IO and calculate the length of that-CodePudding

I wrote the following code to read the first line of the text file and calculate the size of that string, but the calculated size is 1 number greater than the real size that I see on the text file. For example, this string: SAM, my code calculates the size 4; however the size of SAM is 3 or for Hello my code calculates the size 6, I'm wondering what is wrong with my code:

FILE * inp = fopen("name.txt", "r");
char nameArr[30];

fgets(nameArr, 30, inp);

int i;

for(i = 0; nameArr[i] != '\0' && nameArr[i] != '\n';   i)
{
}

if(nameArr[i-1] == ' ')
    --i;
printf("i is %d\n", i);

fclose(inp);

I think the problem if here if(nameArr[i-1] == ' ') but I cannot fix it

CodePudding user response：

I suspect you mean

 int i; <<<=== i here

for(i = 0; nameArr[i] != '\0' && nameArr[i] != '\n';   i)
{
}

if(nameArr[i-1] == ' ')
    --i;
printf("i is %d\n", i);  <<<=== i here

There must be another i declared somewhere too, in which case change the name of this i something else